Answer:
approx 20% of the department faculty have 20 or more years of service
Step-by-step explanation:
To find the percentage of the department faculty with 20 or more years of service, we need to add up the number of faculty members in the "20-24.9" and "25 or more" year categories, since anyone with 20 or more years of service would fall into one of these categories.
Looking at the histogram, we see that there are 24 faculty members in the "20-24.9" year category, and an additional 4 in the "25 or more" year category. Therefore, the total number of faculty members with 20 or more years of service is 24 + 4 = 28.
To calculate the percentage of faculty members with 20 or more years of service, we need to divide this number by the total number of faculty members in the department, which we can find by adding up the heights of all the bars in the histogram. Based on the heights of the bars in the histogram, we can estimate that the total number of faculty members is approximately 140.
Therefore, the percentage of faculty members with 20 or more years of service is:
(28/140) x 100% = 20%
So, approximately 20% of the department faculty have 20 or more years of service.
1. Simply the answers
2. State domain in interval notation
When a variable (or set of letters) in an algebraic statement is substituted, its numerical value is used instead. The expression's total value can then be calculated.
What is the substitute f(x) for x in the expression?Using the given functions, we have:
[tex]f(x) = x^2 + 3[/tex]
[tex]g(x) =[/tex] [tex]\sqrt{(x-4)}[/tex]
To find f(g(x)), we substitute g(x) for x in the expression for f(x):
[tex]f(g(x)) = (g(x))^2 + 3[/tex]
= ([tex]\sqrt{(x-4))^2 + 3}[/tex]
[tex]= (x-4) + 3[/tex]
[tex]= x - 1[/tex]
Therefore,[tex]f(g(x)) = x - 1.[/tex]
To find g(f(x)), we substitute f(x) for x in the expression for g(x):
[tex]g(f(x)) =[/tex] [tex]\sqrt{((f(x)) - 4)}[/tex]
= [tex]\sqrt{((x^2 + 3) - 4)}[/tex]
= [tex]\sqrt{(x^2 - 1)}[/tex]
= |x|[tex]\sqrt{(x^2 - 1)}[/tex]
Therefore, [tex]g(f(x)) =[/tex] |x| [tex]\sqrt{(x^2 - 1)}[/tex]
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Find d2y/dx2 of x²y - 2x = 8
2xy - 2 = 0
Step-by-step explanation:
d2y/dx2 = 2xy - 2(1) = 0
given that f(x)=(x+2)^3-3, write an expression for h(x) in terms of x
h(x)=
In response to the query, we can state that As a result, the cubic equation factored form is: f(x) = (x+3)(x+1)(x-2) (x-2)
What is equation?An equation is a mathematical statement that proves the equality of two expressions connected by an equal sign '='. For instance, 2x – 5 = 13. Expressions include 2x-5 and 13. '=' is the character that links the two expressions. A mathematical formula that has two algebraic expressions on either side of an equal sign (=) is known as an equation. It depicts the equivalency relationship between the left and right formulas. L.H.S. = R.H.S. (left side = right side) in any formula.
A cubic polynomial's graph is the one that is presented. We must determine the polynomial's x-intercepts or roots in order to determine its factored form.
The graph reveals the polynomial's three real roots, which are -3, -1, and 2.
As a result, the polynomial's factored form is:
f(x) = a(x+3)(x+1) (x-2)
where an is a constant that establishes the polynomial's leading coefficient. Using the graph's point (0,-6) as a reference, we may determine the value of a:
f(0) = a(0+3)(0+1)(0-2) = -6
If we condense this phrase, we get:
-6a = -6
When we multiply both sides by -6, we get:
a = 1
As a result, the cubic polynomial's factored form is:
f(x) = (x+3)(x+1)(x-2) (x-2)
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PLEASE HELP ME I NEED THIS FAST TO PASS!!
Answer:-225
Step-by-step explanation:The arithmetic series is given by:
a1 = -1, d=-2, n = 15
where a1 is the first term, d is the common difference, and n is the number of terms.
To evaluate this series, we can use the formula for the sum of an arithmetic series:
Sn = n/2 * [2a1 + (n-1)d]
where Sn is the sum of the first n terms.
Substituting the given values, we get:
S15 = 15/2 * [2(-1) + (15-1)(-2)]
= 15/2 * [-2 - 28]
= 15/2 * (-30)
= -225
Therefore, the sum of the first 15 terms of the arithmetic series with a1 = -1, d=-2 is -225.
solve the equation using completing the square method
ii. x²-x+ 20 = 0
Answer:
If the question is x^2 + x - 20 = 0,
x = -4,5
However, if the question is x^2 - x - 20 = 0,
x = 4, -5
Step-by-step explanation:
WARNING: Your question is incorrect and so, I have tweaked it to make it correct
Completing the square of (x^2 + x - 20):
(x^2 - x) - 20
= (x^2 - x + (1/2)^2 - (1/2)^2) - 20
= (x^2 - x + (1/4))^2 - 1/4 - 20
= (x-1/2)^2 - 81/4
Hence,
(x-1/2)^2 - 81/4 = 0
(x-1/2)^2 = 81/4
x-1/2 = + or - 9/2
x = 9/2 + 1/2 (OR) x = -9/2 + 1/2
x = 5 (OR) x = -4
Hence,
x = -4,5 (CONSIDERING THE QUESTION IS x^2 + x - 20 = 0)
Feel free to mark this as brainliest! :)
Use the long division to divide f(x) =b^4 + 3b^3-35b^2-46b+28 by d(x)= b+7 remember to show all your work cleary steps by steps and express your final answer in the from f(x)= q(x)d(x) +r(x)
The final function is f(x) = ( [tex]b^3-4b^2[/tex]+[tex]63b[/tex]-487b)(b+7)+3021.
What is function?
A mathematical phrase, rule, or law that establishes the link between an independent variable and a dependent variable (the dependent variable). In mathematics, functions exist everywhere, and they are crucial for constructing physical links in the sciences.
Here the given function f(x)=[tex]b^4 + 3b^3-35b^2-46b+28[/tex] and d(x)=b+7.
Now using long division then,
=> [tex]b^3-4b^2[/tex]+[tex]63b[/tex]-487b
[tex]\\b+7)\overline{b^4 + 3b^3-35b^2-46b+28 }\\\\[/tex]
(-) [tex]{b^4+7b^3}[/tex]
[tex]\overline{-4b^3+35b^2+46b-28}[/tex]
(-) [tex]-4b^3-28b^2[/tex]
[tex]\overline{63b^2-46b+28}[/tex]
(-) [tex]63b^2+441b[/tex]
[tex]\overline{-487b-28}[/tex]
(-) [tex]\underline {-487b-3049}[/tex]
3021
Quotient q(x) = [tex]b^3-4b^2[/tex]+[tex]63b[/tex]-487b
Remainder r(x) = 3021
Hence the final function is f(x) = ( [tex]b^3-4b^2[/tex]+[tex]63b[/tex]-487b)(b+7)+3021.
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What is the volume of the following rectangular prism?
Volume
=
=equals
units
3
3
three time three equal 9
The area of a rectangular rug is given by the trinomial r^2 - 8r - 33. What are the possible dimensions of the rug? Use factoring.
The required possible dimensions of the rug are 11 by [tex]\frac{r^2 - 8r - 33}{11}[/tex].
How to factor the equation to find dimensions?The area of the rectangular rug is given by the trinomial:
[tex]$r^2 - 8r - 33$[/tex]
To find the possible dimensions of the rug, we need to factor this trinomial. We can do this by finding two numbers that multiply to -33 and add up to -8. These numbers are -11 and 3:
[tex]$r^2 - 8r - 33 = (r - 11)(r + 3)$[/tex]
Therefore, the possible dimensions of the rug are:
[tex]$r - 11 = 0$[/tex] or [tex]$r + 3 = 0$[/tex]
[tex]$r = 11$[/tex]or $[tex]$r = -3$[/tex]
Since the dimensions of the rug cannot be negative, we can only take the positive value of r, which is r = 11.
Therefore, the possible dimensions of the rug are:
11 by [tex]\frac{r^2 - 8r - 33}{11}[/tex]
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Algebra 1 please help
An exponential function is a function in which the independent variable x appears as an exponent.
a is the y-intercept.
b is the rate of change.
The function is exponential growth when b > 1.
The function is exponential growth when b < 1.
y-intercept is the initial value of the function when x is equal to 0.
Asymptote is the line that the function approaches but does not cross.
What is an exponential function?In Mathematics, an exponential function can be modeled by using this mathematical expression:
f(x) = ab^x
Where:
a represents the base value or y-intercept.x represents time.b represents the rate of change.What is an asymptote?In Mathematics, an asymptote can be defined as a line which the graph of a given function approaches but would never touch or cross.
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Simplify:
2
(
3
x
)
+
(
x
+
10
)
2(3x)+(x+10)
Answer:
7x+10
Step-by-step explanation:
2x(3x)+1x(x+10)
6x+1x+10
7x+10
(a) find the value of x that maximizes the area of the
figure and (b) find the maximum area.
x in.
x in.
1.5x in.
6 in.
The value of x that maximizes the area of the figure is 1.5 inches, and the maximum area is 3.375 square inches.
What is rectangle ?A rectangle is a two-dimensional form that has four full sides and four right angles. Because the opposing sides are parallel and congruent, it is a unique kind of parallelogram.
To find the maximum area of the figure, we need to determine the value of x that will maximize the area.
The area of the figure can be calculated as:
A = (1.5x)(x) + (1/2)(1.5x)(6-2x)
Simplifying the expression:
[tex]A = 1.5x^2 + 4.5x - 3x^2[/tex]
[tex]A = -1.5x^2 + 4.5x[/tex]
To find the value of x that maximizes the area, we need to take the derivative of A with respect to x and set it equal to zero:
dA/dx = -3x + 4.5 = 0
Solving for x:
3x = 4.5
x = 1.5 inches
Now that we know x=1.5 inches maximizes the area, we can substitute it back into the area equation to find the maximum area:
[tex]A = -1.5(1.5)^2 + 4.5(1.5)[/tex]
A = 3.375 square inches
Therefore, the value of x that maximizes the area of the figure is 1.5 inches and the maximum area is 3.375 square inches.
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If m/P = (4x - 1)° and m/R = (12x - 27), find mQPS.
The arc angle QPS is 258 degrees.
How to find the angles of a cyclic quadrilateral?A cyclic quadrilateral is a four sided shape(quadrilateral) that can be inscribed into a circle. The sum of angles in a cyclic quadrilateral is 360 degrees.
The opposite angles of a cyclic quadrilateral have a total of. 180 ° . In other words, the opposite angles of a cyclic quadrilateral is supplementary angles.
Therefore,
m∠P = 4x - 1
m∠R = 12x - 27
Hence,
4x - 1 + 12x - 27 = 180
16x - 28 = 180
16x = 180 + 28
16x = 208
x = 208 / 16
x = 13
m∠R = 12(13) - 27
m∠R = 156 - 27
m∠R = 129 degrees
Therefore,
m∠R = 1 / 2 (QPS)
129 = 1 / 2 × x
x = 129 ×2
x = 258 degrees
Hence,
mQPS = 258 degrees
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Weight | COST
20kg and below 2.00 Naira
Over 20kg and up to 50kg. 9.50 Naira
Over 50kg and up to 100kg 12.30 Naira
Over 100kg and up to 500kg 21.10 Naira
Use the table below to calculate the cost of sending 151kg parcel.=
Use the same table to find the cost of sending 507kg parcel =
Stamp rate:
Stamp | COST
10 stamps and below 55.00Naira
Over 10 stamps up to 50 stamps. 75.00Naira
Over 50 stamps up to 100 stamps 105.00Naira
Find the cost of buying 150 stamps using the table above=
Find the cost of buying 213 stamps with the table above=
Step-by-step explanation:
For a 151kg parcel, we can see that it falls under the category of "Over 100kg and up to 500kg", so the cost would be 21.10 Naira per kg:
Cost of sending 151kg parcel = 21.10 Naira/kg * 151 kg = 3187.10 Naira
For a 507kg parcel, we can see that it falls under the category of "Over 100kg and up to 500kg", so the cost would be 21.10 Naira per kg:
Cost of sending 507kg parcel = 21.10 Naira/kg * 507 kg = 10701.70 Naira
To find the cost of buying stamps, we need to check which category the number of stamps falls under. For 150 stamps, it falls under the category of "Over 10 stamps up to 50 stamps", so the cost would be 75.00 Naira:
Cost of buying 150 stamps = 75.00 Naira
For 213 stamps, it falls under the category of "Over 50 stamps up to 100 stamps", so the cost would be 105.00 Naira:
Cost of buying 213 stamps = 105.00 Naira
please help me i’m struggling and i need to turn this in
The vertices of the image are given as follows:
X'(16.5, -9), Y'(13.5,-4.5) and Z'(4.5,-1.5).
How to obtain the vertices of the image?The original vertices of the triangle are given as follows:
X(6, -2), Y(4,1) and Z(-2,3).
The vertices of the image are obtained applying the transformations in the context of the problem.
The first transformation is T(5,-4), which is a translation, meaning that 5 is added to the x-coordinate of each vertex, while 4 is subtracted from the y-coordinate of each vertex, hence:
X'(11, -6), Y'(9,-3) and Z'(3,-1).
The final transformation is the dilation with a scale factor of 1.5, meaning that each coordinate of each vertex is multiplied by 1.5, hence:
X'(16.5, -9), Y'(13.5,-4.5) and Z'(4.5,-1.5).
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A delivery truck is transporting boxes of two sizes: large and small. The combined weight of a large box and a small box is 70 pounds. The truck is transporting 50 large boxes and 60 small boxes. If the truck is carrying a total of 3800 pounds in boxes, how much does each type of box weigh?
Answer: Large box weight 40 pounds, and small box weight 30 pounds.
Step-by-step explanation:
Let L be the weight of a large box, and S be the weight of a small box.
L + S = 70
50L + 60S = 3800
We change the first equation into the form of L, and we get:
L = 70 - S
And we plugin L = 70 - S into the second equation.
50(70 - S) + 60S = 3800
3500 - 50S + 60S = 3800
3500 + 10S = 3800
-3500 -3500
10S = 300
S = 30
L + S = 70
L + 30 = 70
- 30 - 30
L = 40
Write an equation for the hyperbola shown In the graph.
The equation for the hyperbola is [tex]y^{2} -4x^{2} =144[/tex]
Define the term hyperbola ?A hyperbola is a type of conic section, formed by the intersection of a plane with two cones that have a common vertex. It consists of two separate curves that are mirror images of each other, each of which has two branches that extend to infinity.
By Given figure,
C = (0, 0)
V (0, ±6)
b = 6
equation of asymptotes; [tex]y=[/tex] ±[tex]\frac{a}{b}x[/tex]
then, y = ± [tex]\frac{a}{6} * x[/tex]
given the asymptotes, y = ±2x
by comparing we get, a/6 = 2
a = 12
We know the equation of hyperbola, [tex]\frac{y^{2} }{a^{2} } -\frac{x^{2} }{b^{2} } =1[/tex]
putting the values of a and b, [tex]\frac{y^{2} }{12^{2} } -\frac{x^{2} }{6^{2} } =1[/tex]
[tex]\frac{y^{2} }{144} } -\frac{x^{2} }{36} } =1[/tex]
After Simplification, [tex]y^{2} -4x^{2} =144[/tex]
Therefore, the equation for the hyperbola is [tex]y^{2} -4x^{2} =144[/tex]
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li
People can pick strawberries on a farm.
The pay for the strawberries they pick.
Brian picks 4 ½ kg of strawberries.
He pays a total of £15.75.
Sue wants 500 grams of strawberries.
Brian says she can buy them from him for the same price he paid.
How much should Sue pay Brian for 500 grams of strawberries?
Answer:
Question 10
Not yet answered
Marked out of 1.00
Robert packs potatoes into bags.
He then packs bags into boxes to sell to shops.
Robert has these orders.
P Flag question
Browns
25 hoxes
Brian will receive £[tex]1.75[/tex] from Sue buying [tex]500[/tex] grams of berries.
What is grams vs. kg?The metric measure for a tiny amount of mass and weight is the gram (g). It weighs the same as one milliliter (or one cubic centimeter) of water. 1,000 grams make to one kilogram (kg). One liter liquid water weighs exactly one kilogram (kg).
How should I weigh a gram?Using a scale is the most accurate technique to measure in grams. Kitchen spoons and cups, for example, offer an approximate approximation. Moreover, always have a conversion tool or chart on available so you can estimate grams without a scale.
Brian paid a total of £[tex]15.75[/tex] for [tex]4\frac{1}{2}[/tex] kg of strawberries. To find out the price per gram, we can divide the total cost by the total weight:
Price per gram [tex]=[/tex]Total cost / Total weight
Total weight of strawberries [tex]= 4.5 kg = 4500 grams[/tex]
Price per gram [tex]=[/tex] £[tex]15.75 / 4500[/tex] grams
Price per gram [tex]=[/tex] £[tex]0.0035[/tex] per gram
So, Brian paid £[tex]0.0035[/tex] for every gram of strawberries he picked.
Cost of [tex]500[/tex] grams [tex]=[/tex] [tex]500 grams *[/tex] £[tex]0.0035/gram[/tex]
Cost of [tex]500[/tex] grams [tex]=[/tex] £[tex]1.75[/tex]
Therefore, Sue should pay Brian £[tex]1.75[/tex] for [tex]500[/tex] grams of strawberries.
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How to verify with steps?
[tex]csc(-x)-1~~ = ~~\cfrac{cos^2(x)}{csc(-x)+1} \\\\[-0.35em] ~\dotfill\\\\ \cfrac{cos^2(x)}{csc(-x)+1}\implies \cfrac{1-sin^2(x)}{\frac{1}{sin(-x)+1}}\implies \cfrac{1-sin^2(x)}{\frac{1}{-sin(x)+1}}\implies \cfrac{[1-sin(x)][1+sin(x)]}{ ~~ \frac{-1+sin(x)}{sin(x)} ~~ } \\\\\\\ [1-sin(x)][1+sin(x)]\cdot \cfrac{sin(x)}{-1+sin(x)} \\\\\\\ [1-sin(x)][1+sin(x)]\cdot \cfrac{sin(x)}{-[1-sin(x)]} \\\\\\\ [1+sin(x)][-sin(x)] \implies \boxed{-sin(x)-sin^2(x)} \\\\[-0.35em] ~\dotfill[/tex]
[tex]csc(-x)-1\implies \cfrac{1}{sin(-x)}-1\implies \cfrac{1}{-sin(x)}-1\implies \boxed{\cfrac{-1-sin(x)}{sin(x)}}[/tex]
now, as you can see is a no dice, before doing many simplifications, I often check them graphically, so I know what's cooking, anyhow, Check the picture below, they are definitely not the same, the red one is the one on the right-hand-side.
[tex]x^{2} logx=10xx^{2}[/tex]x^2logx = 10x2
[tex]\begin{array}{llll} \textit{Logarithm Cancellation Rules} \\\\ log_a a^x = x\qquad \qquad \stackrel{ \textit{we'll be using this one} }{a^{log_a (x)}=x} \end{array} \\\\[-0.35em] ~\dotfill\\\\ x^2\log(x)=10x^2\implies \log(x)=\cfrac{10x^2}{x^2}\implies \log(x)=10 \\\\\\ \log_{10}(x)=10\implies 10^{\log_{10}(x)}=10^{10}\implies x=10^{10}\implies x=10000000000[/tex]
Suppose that the weight of seedless watermelons is normally distributed with mean 6.1 kg. and standard deviation 1.2 kg. Let X be the weight of a randomly selected seedless watermelon. Round all answers to 4 decimal places where possible.
a. What is the distribution of X? X ~ N(
b. What is the median seedless watermelon weight?
c. What is the Z-score for a seedless watermelon weighing 7 kg?
d. What is the probability that a randomly selected watermelon will weigh more than 5.1 kg?
e. What is the probability that a randomly selected seedless watermelon will weigh between 5.3 and 6 kg?
f. The 85th percentile for the weight of seedless watermelons is
Answer:
a. X ~ N(6.1, 1.2^2)
b. The median seedless watermelon weight is 6.1 kg.
c. The Z-score for a seedless watermelon weighing 7 kg is 0.75.
d. The probability that a randomly selected watermelon will weigh more than 5.1 kg is 0.7967.
e. The probability that a randomly selected seedless watermelon will weigh between 5.3 and 6 kg is 0.2454.
f. The 85th percentile for the weight of seedless watermelons is 7.2437 kg.
Step-by-step explanation:
a. X ~ N(6.1, 1.2^2)
b. The median of a normal distribution is equal to the mean, so the median seedless watermelon weight is 6.1 kg.
c. The Z-score for a seedless watermelon weighing 7 kg can be calculated as:
Z = (7 - 6.1) / 1.2 = 0.75
Therefore, the Z-score is 0.75.
d. To find the probability that a randomly selected watermelon will weigh more than 5.1 kg, we need to standardize the value using the formula:
Z = (X - μ) / σ
where X is the value we want to find the probability for, μ is the mean, and σ is the standard deviation.
Z = (5.1 - 6.1) / 1.2 = -0.8333
Using a standard normal distribution table or a calculator, we can find the probability that Z is greater than -0.8333 to be 0.7967.
Therefore, the probability that a randomly selected watermelon will weigh more than 5.1 kg is 0.7967.
e. To find the probability that a randomly selected seedless watermelon will weigh between 5.3 and 6 kg, we need to standardize the values and find the area under the normal curve between the two Z-scores. The Z-scores for 5.3 kg and 6 kg are:
Z1 = (5.3 - 6.1) / 1.2 = -0.6667
Z2 = (6 - 6.1) / 1.2 = -0.0833
Using a standard normal distribution table or a calculator, we can find the probability that Z is between -0.6667 and -0.0833 to be 0.2454.
Therefore, the probability that a randomly selected seedless watermelon will weigh between 5.3 and 6 kg is 0.2454.
f. The 85th percentile for the weight of seedless watermelons can be found by finding the Z-score that corresponds to the 85th percentile of a standard normal distribution. Using a standard normal distribution table or a calculator, we can find the Z-score to be 1.0364.
To find the corresponding weight, we can use the formula:
Z = (X - μ) / σ
1.0364 = (X - 6.1) / 1.2
X = 7.2437
Therefore, the 85th percentile for the weight of seedless watermelons is 7.2437 kg.
Hope this helps! I'm sorry if it doesn't. If you need more help, ask me! :]
Answer:
a) N(6.1,1.2)
b) 6.1
c) 0.75
d) 0.7977 (or 79.77%)
e) 0.2143 (or 21.43%)
f) 7.3435 kg (using excel) or 7.348 kg (using normal tables)
Step-by-step explanation:
a) normal distribution just need to be define we his mean and his standard deviation. You just need a sample higher than 30 or to be specified the population is normally distributed
X≈N(μ,σ)= N(6.1,1.2)
b) The median and mean are not necessarily the same, for a normal distribution, which is a symmetric distribution, those values are just the same
c) The equation for Z score is given by:
[tex]z=\frac{x-u}{\sigma}[/tex]
Replacing values:
[tex]Z=\frac{7-6.1}{1.2} =0.75[/tex]
d) first find the Zvalue for 5.1
[tex]Z=\frac{5.1-6.1}{1.2} =-0.83[/tex]
Now, find the probability from Normal Distribution table
P(Z>0.83) = 0.7977
e)
first find the Zvalue fo5.3 and 6
[tex]Z=\frac{5.3-6.1}{1.2} =-0.67[/tex]
[tex]Z=\frac{6-6.1}{1.2} =-0.08[/tex]
Now find probabilities from Normal Distribution table . Notice you need to subtract P(Z>0.08)-P(Z>0.67) if you use a positive table.
P(-0.67<z<-0.08) = 0.2143
f) Find the Z score from a Normal Distribution table that give you an area of 0.8500 (or the closest value), im using excel for this one since the answer from tables have only TWO decimals and can be problematic if you need more decimal places.
this gives a Z of 1.036433389
now use the Zscore equation but solve for X
[tex]z\sigma+u=x[/tex]
x = 1.036433389(1.2)+6.1 = 7.3437 (Using excel)
If i use a table, the closes is 1.04 (0.8508 which is not exactly 0.85)
x = 1.04(1.2)+6.1= 7.348 (using table)
so be carefully with the input if the website needs the decimals places or not.
Question 1
Christi alters a skirt. She cuts 7 inches off the bottom of the skirt and then adds a 5-
inch ruffle to the skirt's remaining bottom edge. Which expression best represents the
final length of the skirt?
Os-12
O2+s
02-s
1 pts
OS-2
Step-by-step explanation:
Let's call the original length of the skirt "l". After cutting 7 inches off the bottom, the remaining length of the skirt is l-7. Then, when Christi adds a 5-inch ruffle, the final length of the skirt becomes:
(l-7) + 5
Simplifying this expression, we get:
l - 2
Therefore, the expression that best represents the final length of the skirt is:
O2 - s
A normal population has a variance of 9.0. A random sample of size 9 and
variance 8.01 was drawn from a normal population. Determine whether the
variance from this random sample is 9.0. Test at 5% level of significance.
We can cοnclude that the variance frοm this randοm sample is nοt significantly different frοm 9.0 at a 5% level οf significance.
What is Variance?In mathematics, variance is a measure οf the spread οr dispersiοn οf a set οf data values. It is calculated as the average οf the squared differences frοm the mean. Variance is cοmmοnly used in statistics tο assess the variability οf a data set and is an impοrtant parameter in many statistical analyses.
Tο test whether the variance frοm this randοm sample is equal tο 9.0, we can use a chi-square test. The test statistic fοr this hypοthesis test is calculated as:
chi-square = (n - 1) × sample variance / pοpulatiοn variance
where n is the sample size.
Substituting the given values, we get:
chi-square = (9 - 1) × 8.01 / 9.0
chi-square ≈ 6.71
The critical chi-square value at a 5% level οf significance and 8 degrees οf freedοm (n - 1) is 15.51. Since the calculated chi-square value οf 6.71 is less than the critical chi-square value οf 15.51, we fail tο reject the null hypοthesis that the variance frοm this randοm sample is equal tο 9.0. In οther wοrds, there is nοt enοugh evidence tο suggest that the variance frοm this randοm sample is different frοm 9.0 at a 5% level οf significance.
Therefοre, we can cοnclude that the variance frοm this randοm sample is nοt significantly different frοm 9.0 at a 5% level οf significance.
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Sophia takes guitar lessons at home every Sunday. Her instructor charges $15 to cover home visit costs, and $30 per hour of training. One Sunday, Sophia's mother pays the instructor $75 for the guitar lessons.
Select the equation that represents the given situation and find the number of hours of Sophia's lesson.
A.
15x + 30 = 75; 3 hours
B.
15x + 30 = 75; 2 hours
C.
30x + 15 = 75; 2 hours
D.
30x + 15 = 75; 3 hours
In a linear equation,The equation to represent the situation is y = 15 + 30x.
The number of hours Sophia used for the guitar training after paying 75 dollars is 2 hours.
What in mathematics is a linear equation?
An algebraic equation with simply a constant and a first-order (linear) term, such as y=mx+b, where m is the slope and b is the y-intercept, is known as a linear equation. The variables in the previous sentence, y and x, are referred to as a "linear equation with two variables" at times.
Sophia's mother pays the instructor $75 for the guitar lessons.
The equation that can be used to represent the given situation is as follows:
let
x = number of hours used for the training
y = total cost
Therefore,
y = 15 + 30x
Now, Sophia's mother spent 75 dollars for her daughters training. Let's find the hours Sophia used.
Therefore,
75 = 15 + 30x
75 - 15 = 30x
60 = 30x
divide both sides by 30
x = 60 / 30
x= 2
Therefore, she used 2 hours for the training.
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BRAAAAINLY USERS PLEASE HELP! 30 points-a!
Solve five-ninths minus two-sixths equals blank.
eight thirty-sixths
twenty fifty-fourths
six-thirds
three-ones
Solve four-sixths minus three-eighths equals blank.
one-eighth
one-sixth
seven forty-eighths
seven over twenty-four
Question 3(Multiple Choice Worth 2 points)
(05.04 LC)
Solve four-sixths minus three-twelfths equals blank.
one-sixth
five-twelfths
seven-twelfths
thirty-six seventy-seconds
The Answer to the questions Two ninths, Seven over twenty-Four, and Five Twelfths for understanding this we have to learn fractions.
What is a fraction?Any number can be called a Fraction if it is in the form of [tex]\frac{p}{q}[/tex] where q≠0.
where p is the numerator of the fraction and q is the denominator of the fraction. The numerator can be 0 but the denominator never is zero.
The elements of a whole or entire set are expressed by fractions. A fraction consists of two components. The numerator is the figure at the top of the line. The denominator is the figure that occurs below the line.
The solutions to the questions are given below :
a. five-ninths minus two-sixths = Two-ninths
b. four-sixths minus three-eighths = Seven over twenty Four
c. four-sixths minus three-twelfths = Five Twelfths
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Answer this question please
Answer:
Reflection only
The mirror line must pass through one of the sides of the triangle.
============================================================
Explanation:
The term "invariant" means "does not vary" i.e. "does not change".
An invariant point is fixed in place.
Here are the list of geometric transformations
Translation (aka shifting)RotationReflectionDilationSome geometry textbooks will mention "glide reflection", but that's really just a combination of translation and reflection. That means we can ignore it.
Let's go through each item to see if we can get two vertices to stay glued in their spot.
With translations, it's impossible to have invariant points. Every point will change location. Therefore, we cannot have two invariant vertices for any translation. We cross translation off the list.Rotations are a little better. We have one point that doesn't move: the center of rotation. Unfortunately every other point that isn't the center will rotate around the center (and hence change location). We cross rotations off the list.Reflections are the transformation that will be able to hold two vertices fixed in place. Any point on the mirror line will not change location. If we draw the mirror line through a side of the triangle, then it will guarantee two vertices will stay in place. This is why reflection is the only answer.Dilations are similar to rotations in that they have one invariant point. The center of dilation stays where it is, but everything else moves closer to the center (if the scale factor is between 0 and 1) or moves away from the center (if the scale factor is larger than 1). We cross dilations off the list.In short we have eliminated: translations, rotations, and dilations. The only thing that works is reflections
Leticia invests $200 at 5% interest. If f(x) represents the amount of money after x time periods, which exponential function best represents this situation?
The amount of money Leticia has after x time periods can be calculated using the formula:
f(x) = P(1 + r)^x
where P is the principal (initial amount invested), r is the annual interest rate (expressed as a decimal), and x is the number of time periods.
Substituting the given values, we get:
f(x) = 200(1 + 0.05)^x
Simplifying this expression, we get:
f(x) = 200(1.05)^x
Therefore, the exponential function that best represents this situation is:
f(x) = 200(1.05)^x
If $f(x)=4x^3+1$, find $f^{-1}(33)$.
The value of the inverse function of f(x), that is, f⁻¹(33) is 2.
How is the inverse function of a given function found?A function takes in values, applies specific operations to them, and produces an output. The inverse function acts, agrees with the outcome, and returns to the initial function. In general, switching the coordinates x and y is how an inverse is calculated. Although not strictly a function, this freshly constructed inverse is a relation.
To guarantee that the original function's inverse will likewise be a function, the original function must be a one-to-one function. Only when every second element matches the first value is a function deemed to be a one-to-one function.
Given that,
f(x)=4x³+1
Also, f⁻¹(33).
Thus, using the input and output corresponding values we have:
f(x) = 4x³ + 1 = 33
x³ = 8
Taking the cube root of both sides, we get:
x = 2
Hence, the value of the inverse function of f(x), that is, f⁻¹(33) is 2.
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Solve and graph the following compound inequality 4-m<-2 or 12<-5m+2. Solve before labeling the number line.
As a result, the compound inequality has the following solutions: m > 6 or m < -2 as by split both sides by -5 and reverse the inequality.
what is inequality ?An inequality in mathematics is a comparison between two values or expressions that specifies whether they are equal, greater than, or less than one another. "!=" (greater than or equal to), and "=" (less than or equal to) are used to represent inequality (not equal to). For instance, the inequality "x > 2" denotes that the value of x is more than 2, while the inequality "5 7" denotes that 5 is less than 7. Variables may be utilized in inequalities, which can be used to indicate a variety of values or circumstances that satisfy the inequality.
given
Let's resolve each inequality in turn, then add the results:
4 - m < -2 (subtract 4 from both sides) (subtract 4 from both sides)
-m < -6 (divide both sides by -1 and invert the inequality) (divide both sides by -1 and reverse the inequality)
m > 6
12 < -5m + 2 (subtract 2 from both sides) (subtract 2 from both sides)
10 < -5m (split both sides by -5 and reverse the inequality) (divide both sides by -5 and reverse the inequality)-2 > m
As a result, the compound inequality has the following solutions: m > 6 or m < -2 as by split both sides by -5 and reverse the inequality.
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Suppose you want to have $700,000 for retirement in 35 years. Your account earns 7% interest. How much would you need to deposit in the account each month?
Answer:
Therefore, you would need to deposit $1,068.19 each month to have $700,000 in 35 years with a 7% interest rate.
Step-by-step explanation:
Carly picked m mangoes
a) On Monday, she added 4 mangoes to what she picked and shared the total equally into 2 groups. Write an expression to represent the number of mangoes in each group.
b) On Tuesday, she had twice the number of mangoes picked then added 2 more mangoes. If she shared this total into 3 equal groups, write an expression to represent the number of mangoes in
each group.
c) If Carly subtracted the number of mangoes in each group on Tuesday from the number of mangoes in each group on Monday, she will have 3 mangoes left Write an equation to represent
this information.
d) Hence, calculate the number of mangoes she picked.
The number of mangoes she picked is 2.
What is number?Number is the concept of a mathematical object used to count, measure, and label. It is an abstract concept, though most familiar in the form of numerals such as "3" or "10". Numbers allow us to compare and manipulate amounts, sequences, shapes, and patterns. They also allow us to create models and make predictions. As a result, they are essential tools in a variety of disciplines, from mathematics and physics to engineering and economics.
Let x be the number of mangoes in each group on Monday. The expression representing the number of mangoes in each group is x + 4/2 = x + 2.
b) Let y be the number of mangoes in each group on Tuesday. The expression representing the number of mangoes in each group is 2y + 2/3 = 2y + 2/3.
c) Let z be the number of mangoes left after subtracting the number of mangoes in each group on Tuesday from the number of mangoes in each group on Monday. The equation representing this information is x + 2 - (2y + 2/3) = z.
d) Substituting the expression for x and y in the equation, we get: (2y + 2/3) + 2 - (2y + 2/3) = z.
Solving the equation, we get z = 2.
Hence, the number of mangoes she picked is 2.
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