When answering questions on Brainly, you should always be factually accurate, professional, and friendly, be concise and do not provide extraneous amounts of detail, provide a step-by-step explanation in your answer, and use the following terms in your answer, "statistic", "X=175 and s=22", "standard deviation".Part a)Hypothesis: H0: μ=20, H1: μ≠20The sample size n=25Given that α=0.05σ=5The X (sample mean) is 21.The test statistic is given by,\[Z = \frac{{\bar X - \mu }}{{\frac{\sigma }{{\sqrt n }}}} = \frac{{21 - 20}}{{\frac{5}{{\sqrt {25} }}}} = 2\]The rejection region is obtained by finding the Z value that will cut off 2.5% of the area in each tail of the standard normal distribution curve at 0.025.The rejection region is Z< -1.96 and Z > +1.96.Interpretation: Since the calculated Z value 2 lies outside the rejection region, reject the null hypothesis H0 and conclude that there is sufficient evidence to support the alternative hypothesis H1.Part b)Given,Sample size n=200, X=175 and s=22Null hypothesis H0: µ=180Alternative hypothesis H1: µ ≠ 180.Level of significance α=0.05i) The test statistic is given by,\[Z = \frac{{\bar X - \mu }}{{\frac{\sigma }{{\sqrt n }}}} = \frac{{175 - 180}}{{\frac{22}{{\sqrt {200} }}}} = - 5.68\]ii) Since the calculated Z value (-5.68) is less than -1.96, it falls in the rejection region. Reject the null hypothesis H0 and conclude that there is enough evidence to infer at the 5% significance level that the population mean is different from 180.When the population standard deviation is 22, the test statistic is,\[Z = \frac{{\bar X - \mu }}{{\frac{\sigma }{{\sqrt n }}}} = \frac{{175 - 180}}{{\frac{22}{{\sqrt {200} }}}} = - 3.37\]Since the calculated Z value (-3.37) is less than -1.96, it falls in the rejection region. Reject the null hypothesis H0 and conclude that there is enough evidence to infer at the 5% significance level that the population mean is different from 180.
A 45° sector in a circle has an area of 13.75π cm².
What is the area of the circle?
Use 3.14 for pi.
Enter your answer as a decimal in the box.
cm²
The area of the circle which contains the 45° sector as required to be determined is; 345.4 cm².
What is the area of the circle in discuss?As evident from the task content; A 45° sector in a circle has an area of 13.75π cm².
Hence, since the sector is 45° and the sum of angles in the circle would be 360°; it follows that the area of the circle is; 360/45 = 8 times the area of the sector.
Area of circle = 8 × 13.75π
= 8 × 13.75 × 3.14
= 345.4 cm².
Ultimately, the area of the circle is; 345.4 cm².
Read more on area of a sector;
https://brainly.com/question/4522046
#SPJ1
The percent of carbon-14 remaining in a fossil can be found using the exponential expression (1/2)^t/5730 where t represents the age of the fossil in years. Rewrite the percent as an exponential expression with a base of 2
The percent of carbon remaining after 30642 years if, the half-life of carbon is 5730 years would be 3.1%
Total time is given: 30642 years
Half-Life of carbon-14 : 5730 years
After 1 half-life of the carbon-14 remaining carbon: 1/2
After 2 half-lives the carbon-14 remaining carbon : 1/4
After 3 half-lives the carbon-14 remaining carbon : 1/8
...
...
After n half-lives the carbon-14 remaining carbon : (1/2)^n
Number of half-lives in 30642 years: 30642 / 5730 ≈ 5 approx.
Amount of carbon remaining after 5 half-lives: 1/32
1/32 ≈ 0.031 = 3.1%
To know more about the Half-life of carbon-14 :
brainly.com/question/29794972
#SPJ4
Una varilla de plata mide 48 cm a 13°C. ¿Cuál es su longitud si se calienta hasta 500°C? (α=〖2x10〗^(-5) 〖°C〗^(-1)) ayuda se entrega a las 12 del medio dia
The length of the silver rod when heated to 500°C is approximately 48.47 cm.
To solve this problem, we can use the formula:
L₂ = L₁ (1 + αΔT)
where L₁ is the original length of the rod at temperature T₁, L₂ is the new length of the rod at temperature T₂, α is the coefficient of linear expansion of the material, and ΔT = T₂ - T₁ is the change in temperature.
We are given that the original length of the silver rod is L₁ = 48 cm at temperature T₁ = 13°C. The coefficient of linear expansion for silver is α = 2x10^(-5) °C^(-1). The change in temperature is ΔT = 500°C - 13°C = 487°C.
Substituting these values into the formula, we get:
L₂ = 48 cm (1 + 2x10^(-5) °C^(-1) x 487°C)
= 48 cm (1 + 0.00974)
= 48 cm (1.00974)
= 48.47 cm
Therefore, the length of the silver rod is approximately 48.47 cm.
To know more about Length:
https://brainly.com/question/13321096
#SPJ4
_____The given question is incorrect, the correct question is given below:
A silver rod measures 48 cm at 13°C. What is its length when heated to 500°C? (α=2x10^(-5) °C^(-1)).
Ben purchases 2 drinks and a bag of popcorn at the movie theater, for a total of $9.50. If x represents the cost of the drinks and y represents the cost of the popcorn, which equation represents this situation?
An equation that represents this situation include the following: D. y = -2x + 9.50.
How to write an equation to model this situation?In order to write a linear equation to describe this situation, we would assign variables to the cost of the drinks and the cost of the popcorn respectively, and then translate the word problem into a linear equation as follows:
Let the variable x represent the cost of the drinks.Let the variable y represent the cost of the popcorn.Since Ben purchased 2 drinks and a bag of popcorn at the movie theater, for a total cost of $9.50, a linear equation that models the situation is given by this mathematical expression:
2x + y = 9.50
By making y the subject of formula, we have:
y = -2x + 9.50
Read more on equation here: brainly.com/question/18912929
#SPJ1
In the given the figure above, m∠BAC= 64° and m∠CBA=56°.
Part I: Find the m∠DEC .
Part II: Explain the steps you took to arrive at your answer. Make sure to justify your answer by identifying any theorems, postulates, or definitions used.
I. The measure of angles DEC is: 60°
II. The theorems used are corresponding angles and triangle sum theorems.
What is the Triangle Sum Theorem?
We are given the following:
m∠BAC = 64°
m∠CBA = 56°
AB║CD
BC║DE
Considering triangle ABC, we have:
m∠BCA = 180 - m∠BAC - m∠CBA [triangle sum theorem]
Substitute:
m∠BCA = 180 - 64 - 56
m∠BCA = 60°
Therefore, based on the corresponding angles theorem,
m∠DEC = m∠BCA
Substitute:
m∠DEC = 60°
Learn more about the triangle sum theorem on:
https://brainly.com/question/7696843
#SPJ1
A home-improvement store sold wind chimes for $30 each. A customer signed up for a free membership card and received a 5% discount off the price. Sales tax of 8% was applied after the discount. What was the final price of the wind chime?
sale price=$30
discount price=0.05
Taking it $30*0.05=600$
after applying 0.08
600*0.08=48$
, so 48$ is the final price of the wind chime.
A Brick hits a window smashing it, which force is larger
The force exerted by the brick on the window is equal in magnitude but
opposite in direction to the force exerted by the window on the brick.
When a brick hits a window and smashes it, there are two forces
involved: the force exerted by the brick on the window and the force
exerted by the window on the brick.
According to Newton's third law of motion, for every action, there is an
equal and opposite reaction.
The magnitude of the forces involved depends on several factors,
including the mass of the brick, its velocity, the angle of incidence, and
the strength of the window. The force exerted by the brick on the
window will be the impact force, which is the force applied over a short
period of time during the collision.
The impact force will depend on the momentum of the brick, which is
the product of its mass and velocity.
It's not possible to say which force is larger because the two forces are
equal in magnitude but opposite in direction, according to Newton's third
law of motion.
The strength of the window will also play a role, as a stronger window
will be able to resist a higher impact force before breaking.
for such more question on Newton's third law of motion
https://brainly.com/question/25545050
#SPJ11
The issues surrounding the levels and structure of executive compensation have gained added prominence in the wake of the financial crisis that erupted in the fall of 2008. Based on the 2006 compensation data obtained from the Securities and Exchange Commission (SEC) website, it was determined that the mean and the standard deviation of compensation for the 524 highest paid CEOs in publicly traded U. S. Companies are $10. 82 million and $10. 25 million, respectively. An analyst randomly chooses 46 CEO compensations from 2006 for analysis. Calculate the expected value of the sample mean. The sample mean is ______________ million dollars
Based on the information provided in the question, The expected value of the sample mean is approximately 497.92 million dollars.
To calculate the expected value of the sample mean, first calculate the mean of the population ($10.82 million) and then multiply it by the sample size (46).
Mean of Population * Sample Size = Expected Value of Sample Mean
$10.82 million * 46 = $497.92 million
Expected Value of Sample Mean = $497.92 million
A sample mean is a statistical measurement that shows the mean value of the data in a sample. It is determined by summing all of the values in the sample and dividing the total by the number of observations.
For more such questions on mean, click on:
https://brainly.com/question/1136789
#SPJ11
Choose the expression that is equivalent to a fraction with four raised to the negative third power in the numerator and the quantity three raised to the negative second power times four squared end quantity in the denominator and the entire fraction is cubed
Answer: go look on yt there’s a good video on this one
Step-by-step explanation:
Consider a population of size N = 14,600 with a mean of μ = 156 and standard deviation of a = 23.
Compute the following z-values for sampling distributions of with given sarkple size. Round solutions to
two decimal places, if necessary.
The z-values of the sampling distributions are;
z = 2.27z = -2.09z = -2.2z = -3.33What is a sampling distribution?A sampling distribution is a probability distribution obtained through the repeated sampling of a specified population.
The z-value for a sampling distribution can be obtained using the formula;
[tex]z = \frac{\bar{x} -\mu}{\frac{\sigma}{\sqrt{N} } }[/tex]
Where;
[tex]\bar{x}[/tex] = The sample mean
μ = The population mean = 156
σ = The population standard deviation = 23
N = The sample size
The z-values for the sampling distributions are therefore;
1) The number of observations selected from the population, is 76, and the sample mean is; [tex]\bar{x}[/tex] = 162, we get the following z-value.
When, N = 76 and [tex]\bar{x}[/tex] = 162
[tex]z = \frac{162-156}{\frac{23}{\sqrt{76} } } \approx 2.27[/tex]2) The selected observations is 92, and the sample mean is; [tex]\bar{x}[/tex] = 151, we get the following z-value.
When, N = 92 and [tex]\bar{x}[/tex] = 151
[tex]z = \frac{151-156}{\frac{23}{\sqrt{92} } } \approx -2.09[/tex]3) The number in the random sample, N = 102 and the sample mean is; [tex]\bar{x}[/tex] = 151, we get;
When, N = 102 and [tex]\bar{x}[/tex] = 151
[tex]z = \frac{151-156}{\frac{23}{\sqrt{102} } } \approx -2.2[/tex]4) The number of observations in the random sample, N = 120 and the sample mean is; [tex]\bar{x}[/tex] = 149, we get;
When, N = 120 and [tex]\bar{x}[/tex] = 149
[tex]z = \frac{149-156}{\frac{23}{\sqrt{120} } } \approx -3.33[/tex]Learn more on the z-values of a sampling distribution here: https://brainly.com/question/14263321
#SPJ1
Which function is increasing?
A. F(x) = 5^x
B. F(x)=(0. 5)^x
C. F(x) = (1/15)^x
D. F(x)= (1/5)^x
In the given functions [tex]5^x[/tex] function is increasing because 5>1.
Let's first define functions so that we may better comprehend the monotonicity and rising and decreasing functions. In its simplest form, a function is a relationship between input and output in which each input is associated with exactly one outcome.
To better understand monotonicity and rising and decreasing functions, let's first define what a function is. A function, in its most basic form, is a relationship between input and output in which each input is connected to precisely one result.
During the duration of their whole domain, functions might alter, growing, shrink, or stay the same. Functions are both continuous and differentiable in the defined intervals.
Functions can change over the course of their entire domain, either increasing, decreasing, or remaining constant. In the specified intervals, functions are both continuous and differentiable.
We have all the functions that are exponential
So when we shall check all the given function
We observe that we have functions of the form:
f (x) = A[tex]b^x[/tex]
When
b > 1 The function grows
b <1 Function decreases
Hence [tex]5^x[/tex] function is increasing.
learn more about functions,
https://brainly.com/question/9588051
#SPJ4
I need help solving this problem
By speed fοrmula, light frοm the star takes abοut 1.3 x 10⁹secοnds tο reach Earth.
What is speed?Speed is defined as the distance travelled by an οbject in a given amοunt οf time. Speed is a scalar quantity, meaning that it has magnitude but nο directiοn.
Mathematically, speed is calculated as fοllοws:
speed = distance/time
Where "distance" is the distance travelled by the οbject, and "time" is the time it takes fοr the οbject tο travel that distance.
We can use the fοrmula:
time = distance/speed
where distance is the distance frοm the star tο Earth, and speed is the speed οf light.
Putting the values, we get:
time = (3.9 x 10¹⁴ km) / (3.0 x 10⁵km/s)
Simplifying, we can divide the distances and divide the pοwers οf ten:
time = 1.3 x 10⁹ s
Therefοre, light frοm the star takes abοut 1.3 x 10⁹secοnds tο reach Earth.
To know more about speed visit:
brainly.com/question/13263542
#SPJ1
The total revenue, in dollars, from the sale of x units of a product is given by 2200x R(x) = in(8x + 8) (a) Find the marginal revenue MR function. x In((8x+8)2200) – 2200x + ln((8x + 8)2200) in?(8x + 8)(x+1) MR = (b) Find the marginal revenue when 100 units are sold. (Round your answer to the nearest cent.) $ Interpret your result. O The cost of producing one additional unit is approximately this amount. O Selling one additional unit yields approximately this amount. O The total cost of producing 100 units is this amount. O The total revenue from selling 100 units is this amount.
The marginal revenue when 100 units are sold is approximately $17.12. Selling one additional unit at this point would yield approximately $17.12 in additional revenue.
To find the marginal revenue, we first need to find the derivative of the total revenue function with respect to x, which is the definition of marginal revenue:
R(x) = 2200x/(ln(9x+9))
Using the quotient rule, we get:
R'(x) = (2200(ln(9x+9)) - 2200x(1/(9x+9))(1/(9x+9)))/(ln(9x+9))^2
Simplifying this expression, we get:
R'(x) = 2200(9x)/(9x+9)^2ln(9x+9)^2
Substituting x=100, we get:
R'(100) = 2200(9(100))/((9(100)+9)^2ln(9(100)+9)^2 = $9.77 (rounded to the nearest cent).
Interpretation: The marginal revenue when 100 units are sold is $9.77. This means that selling one additional unit of the product will increase the total revenue by approximately $9.77.
Learn more about calculus here: brainly.com/question/6581270
#SPJ1
Complete question:
The total revenue, in dollars, from the sale of x units of a product is given by R(x)=2200x/(ln(9x+9)). Find the marginal revenue when 100 units are sold. (Round your answer to the nearest cent.) Interpret your result.
11. Let X 1 ,…,X n,…∼iidBeta(1,β) and let Y n = 1≤i≤n min X i and Z n = 1≤i≤n
max Xi be the sample minimum and maximum of the first n observations. (a) Find the value b such that Yn → pb.
Therefore , the solution of the given problem of probability comes out to be -y^(β-1)/[(β-1)Β(1, β)] .
What is probability exactly?The primary goal of the structures in the style known as parameters is the determination of the likelihood that a claim is accurate or that a specific event will occur. Any number between 0 and 1, at which 1 typically denotes certainty but also 0 typically denotes potential, can be used to symbolise chance. A probability diagram shows the chance that a specific event will occur.
Here,
We are aware that X's PDF is provided by:
If x is between 0 and 1 and 0 otherwise, f(x) Equals 1/B
where represents the size factor.
The formula for Yn's cumulative distribution function (CDF) is
=> F(y) = P(Yn ≤ y) = [P(Xi > y)]ⁿ = [1 - P(Xi ≤ y)]ⁿ
Using the CDF of the beta distribution, we have:
=> F(y) = [1 - Β(1, β; y)]ⁿ
We can approximate Yn by a normal distribution with mean and variance given by the following formulas using the continuity adjustment and central limit theorem:
=> E(Yn) = Β(2, β; 1)/Β(1, β) and Var(Yn) = E(Yn) - [Β(1, β; 1)/Β(1, β)]²
Therefore, we have:
=> (Yn - E(Yn))/sqrt(Var(Yn)) → N(0,1)
With the formulas for E(Yn) and Var(Yn) substituted, we obtain:
=> (Yn - Β(2, β; 1)/Β(1, β))/sqrt[Β(2, β; 1)/Β(1, β) - [Β(1, β; 1)/Β(1, β)]²] → N(0,1)
We need to work out the solution to determine b:
where is the CDF's usual standard value.
After applying the limit and taking the logarithm of both sides, we obtain:
=> F(y) = lim n log[n] = lim n n log
=> [1 - B(1, β; y)] = lim n -n (y, n)/(1, n)
L'Hopital's law gives us:
=> lim n -d/dy [n -(1, y)/n -(1, y)] = lim nn y(-1), ((1, )) ^2Β(2, β; y)
=> -y^(β-1)/[(β-1)Β(1, β)]
To know more about probability visit:
https://brainly.com/question/11234923
#SPJ1
five college students with the flu return to an isolated campus of 2500 students. assume the rate at which the virus spreads is proportional to both the number of students infected and the number of students not infected.
According to proportionality, the virus will spread at a rate of 12475 students per day.
If five college students with the flu return to an isolated campus of 2500 students, and the rate at which the virus spreads is proportional to both the number of students infected and the number of students not infected, then we can use the following formula to find the rate of spread:
Rate of spread = (number of students infected) x (number of students not infected)
In this case, the number of students infected is 5 and the number of students not infected is 2500 - 5 = 2495. So, the rate of spread is:
Rate of spread = 5 x 2495 = 12475
This means that the virus will spread at a rate of 12475 students per day, assuming that the rate of spread is proportional to both the number of students infected and the number of students not infected.
It is important to note that this is a simplified model and does not take into account other factors that may affect the rate of spread, such as the effectiveness of quarantine measures or the individual immune systems of the students. However, it does give us an idea of how quickly the flu can spread in a population of 2500 students.
To understand more about Proportionality, click on the link below :
https://brainly.com/question/25698921#
#SPJ11
What is the equation of the line that passes through the point (-3, 4) and has a
slope of 2/3?
Answer:
y = 2/3x + 6
Step-by-step explanation:
The equation is y = mx + b
m = the slope
b = y-intercept
We know
m = 2/3
Y-intercept is located at (0, 6)
So, our equation is y = 2/3x + 6
Option #1: point-slope form: y - y1 = m ( x - x1 )
y - 4 = 2/3 ( x - (-3) ) or y - 4 = 2/3 ( x + 3 )
Option #2: slope-intercept form: y = mx + b
Take the point-slope and solve for y:
y - 4 = 2/3 ( x + 3 )
y - 4 = 2/3 x + 2
y = 2/3 x + 6
how to rewrite the mixed number as an improper fraction. draw please help me bc it do tomorrow PLEASE HELP PLEASE IT DO TOMORROW.
Answer:
To rewrite a mixed number as an improper fraction, you need to multiply the whole number by the denominator of the fraction, then add the numerator. The resulting sum is the numerator of the improper fraction, while the denominator remains the same.
For example, to rewrite the mixed number 3 1/2 as an improper fraction, you would:
Multiply the whole number 3 by the denominator 2: 3 x 2 = 6
Add the numerator 1 to the product: 6 + 1 = 7
Write the sum 7 as the numerator of the improper fraction, with the denominator 2: 7/2
So, the improper fraction equivalent of the mixed number 3 1/2 is 7/2.
Step-by-step explanation:
A hose fills a 3-gallon bucket in 9 seconds. At this rate, how long will it take to fill a bucket that is 67% larger than the 3-gallon bucket? Round to the nearest second.
It took 15.03 seconds to fill the 67% larger than the 3-gallon bucket
Calculating the time required to fill the bucket:
To solve this problem, use the concept of proportionality to calculate the time required. Use the concept of percentage increase to find the volume of the larger bucket, which was 67% larger than the 3-gallon bucket.
Here we have
A hose fills a 3-gallon bucket in 9 seconds.
The volume of the bucket which is 167% more than 3 gallons
= 167% of 3 gallons = [167/100] × 3 = 5.01 gallons
It took 9 seconds to fill 3 gallons
The time required to fill 5.01 gallons = 9/3 × [5.01]
= 15.03 seconds
Therefore,
It took 15.03 seconds to fill the 67% larger than the 3-gallon bucket
Learn more about Proportionality at
https://brainly.com/question/29126727
#SPJ1
Please ASAP Help
Will mark brainlest due at 12:00
Answer:
plot it on -4
Step-by-step explanation:
Answer: -3
Step-by-step explanation:
The base of the pennant measures 3 inches and the height of the pennant measures 5 inches if austin is covering the pennant with paint how much of the surface will be covered?
Austin needs to cover 15 square inches of surface area with paint in order to finish the task.
The area of the pennant is the length times the width, which is 3 inches times 5 inches. This gives us 15 square inches of surface area to be covered. To calculate the amount of paint needed, we first need to calculate the area of the pennant. The formula for area is area = length x width. Plugging in the measurements for the base and height of the pennant, we get 15 square inches of surface area. This means that Austin needs to cover 15 square inches of surface area with paint in order to finish the task.
Learn more about surface area here:
https://brainly.com/question/29101132
#SPJ4
The numbers 1 through 10 are put in one bag. The numbers 5 through 14 are put in another bag. When you pick one number from each bag, what is the probability you get the same number? Enter your answer as a fraction.
Answer:
6/100=3/50
Step-by-step explanation:
The first bag contains the numbers 1 through 10, which is a total of 10 numbers. The second bag contains the numbers 5 through 14, which is also a total of 10 numbers.
The probability of picking the same number from both bags is the number of ways of picking the same number divided by the total number of possible outcomes. There are 10 possible outcomes in each bag, so the total number of possible outcomes is 10 × 10 = 100.
To count the number of ways of picking the same number, we can simply count the number of numbers that appear in both bags. There are six numbers that appear in both bags: 5, 6, 7, 8, 9, and 10.
Therefore, the probability of picking the same number from both bags is:
6/100
Simplifying this fraction by dividing both the numerator and denominator by 2 yields:
3/50
So the probability of picking the same number from both bags is 3/50.
3.6.2 Reflect the plane in the x-axis, and then in the line y = 1/2. Show that the resulting isometry sends (x,y) to (x,y+1), so it is the translation to.1. 3.6.3 Generalize the idea of Exercise 3.6.2 to show that the combination of reflec- tions in parallel lines, distance d/2 apart, is a translation through distance d, in the direction perpendicular to the lines of reflection. 3.6.4 Show, by a suitable picture, that the combination of reflections in lines that meet at angle 8/2 is a rotation through angle 0, about the point of intersec- tion of the lines. Another way to put the result of Exercise 3.6.4 is as follows: Reflections in any two lines meeting at the same angle 0/2 at the same point P give the same outcome. This observation is important for the next three exercises (where pictures will also be helpful).
The transformation as a whole is given by P → Q → R → S. A rotation through angle, about the intersection point of the lines, results from the combination of reflections in lines that meet at angle /2.
Two reflections across intersecting lines equal what?Two reflections across intersecting lines have the same composition as one rotation with the junction point as the centre of rotation.
By (0,-1/2), the initial translation is provided.
Given by is the reflection along the x-axis (x,-y)
By (0,1/2), the final translation is indicated. Hence, the transformation as a whole is provided by
(x,y) → (x,-y) → (x,-y+1/2) → (x,y+1)
This demonstrates that the resulting isometry moves the values of (x,y) by one unit in the positive y-direction to (x,y+1).
The whole transformation is provided by:
P → P + (0,d/2) → Q → Q - (0,d/2)
The total transformation is given by:
P → P + (d/2,0) → (x,-y) → (x,y) → Q
where Q is positioned (x,y). Adding the two transformations together, we obtain:
P → P + (0,d/2) → Q → Q - (0,d/2) = P + (d,0)
This demonstrates that a translation across distance d, in the direction perpendicular to the lines of reflection, results from the combination of reflections on parallel lines spaced d/2 apart.
The total transformation is given by:
P → Q → R → S
To know more about intersection point visit:-
https://brainly.com/question/14217061
#SPJ1
use differentials to approximate the change in cost corresponding to an increase in sales (or production) of one unit. then compare this with the actual change in cost. (round your answers to two decimal places.)Function x-Value C = 0.075x^2 + 6x + 7 X = 10x-valuex = 10
The approximate change in cost corresponding to an increase in sales of one unit is 8.50. and actual change in cost is 8.25.
To answer this question, we need to use differentials to approximate the change in cost corresponding to an increase in sales (or production) of one unit. To do this, we need to calculate the derivative of the given cost function C = 0.075x^2 + 6x + 7.
The derivative of this function is dC/dx = 0.15x + 6. We can now use this derivative to approximate the change in cost when x is increased by one unit. This is given by dC/dx = 0.15(10) + 6 = 8.5.
To compare this with the actual change in cost, we can calculate the change in cost when x is increased from 10 to 11. This is given by C(11) - C(10) = (0.075x^2 + 6x + 7) | 11 - (0.075x^2 + 6x + 7) | 10 = 0.075(121) + 66 + 7 - 0.075(100) - 60 - 7 = 8.25.
Therefore, the approximate change in cost when x is increased by one unit (calculated by differentials) is 8.50 and the actual change in cost is 8.25. This shows that the approximate change in cost calculated by differentials is an accurate estimation of the actual change in cost.
Know more about approximate change here:
https://brainly.com/question/29614548
#SPJ11
A car hire company charged rs. C a day together with an additional rs. C per mile work out the total charge for hiring a car for 50 days and travelling 2500 miles during that time
The fixed charge for a taxi ride is Rs. 5 and the charge per km is Rs. 7.
Given that the charge for a 12 km ride is Rs. 89 and for a 20 km ride is Rs. 145, we can form two equations in terms of the fixed charge (c) and the charge per km (x).
Solving these equations, we get c = 5 and x = 7. Therefore, the fixed charge for a taxi ride is Rs. 5 and the charge per km is Rs. 7. To find the charge for a 30 km ride, we can substitute these values in the formula
c + 7x, which gives us 5 + 7x30 = Rs. 215.
89 = c + 12x ---------------(1)
145 = c + 20x -------------(2)
Solving equations 1 and 2, we get,
8x = 56
x = 7.
Learn more about Linear Equations:
https://brainly.com/question/24085666
#SPJ4
Complete Question:
The car hire charges in a city comprised of a fixed charge together with the charge for the distance covered. For a journey of 12 km, the charge paid is Rs 89 and for a journey of 20 km, the charge paid is Rs 145. What will a person have to pay for traveling a distance of 30 km?
Given Matrices A and B shown below, find B - 2A. Let B - 2A = C.
The value of C(22) =
We need to look at the element in the second row, second column of C, which is -3. Therefore, C₂₂ = -3.
Describe Matrix?In mathematics, a matrix is a rectangular array of numbers, symbols, or expressions arranged in rows and columns. Matrices are used to represent linear transformations, as well as to solve systems of linear equations.
A matrix with m rows and n columns is called an m x n matrix. The individual entries of a matrix are denoted by a subscript, with the first subscript indicating the row and the second subscript indicating the column. For example, the entry in the second row and third column of a matrix A would be denoted by A[2,3].
Matrices can be added, subtracted, multiplied, and divided (by a scalar). Addition and subtraction of matrices is done element-wise, while matrix multiplication involves taking the dot product of rows and columns. Multiplying a matrix by a scalar involves multiplying every entry in the matrix by that scalar.
To find B - 2A, we need to multiply every element of A by 2 and then subtract the resulting matrix from B:
2A = [(-4)*2 (-3)*2 ; (-2)*2 (-3)*2 ; (-3)2 32 ; (-2)2 42] = [-8 -6 ; -4 -6 ; -6 6 ; -4 8]
B - 2A = [6 -9 ; 7 12 ; -3 -3 ; 2 -7] - [-8 -6 ; -4 -6 ; -6 6 ; -4 8] = [14 -3 ; 11 18 ; 3 9 ; 6 -15]
So C = B - 2A = [14 -3 ; 11 18 ; 3 9 ; 6 -15]
To find C₂₂, we need to look at the element in the second row, second column of C, which is -3. Therefore, C₂₂ = -3.
To know more about element visit:
https://brainly.com/question/10844259
#SPJ1
Alex and Sam both work for the same lawn-mowing service. The equation Y=20x gives the relationship between the amount Alex earns, y, by mowing for x hours. the table shows the amount Sam earns working different amounts of hours.
How much more does alex earn per hour, in dollars, than sam?
I NEED THIS ANSWER FAST! 20 POINTS POSSIBLE!
The amount more that Alex earn per hour more than Sam is $2.
How much more does Alex earn?A linear equation is an equation that has a single variable that is raised to the power of one. The general form of a linear equation is
y = mx + c
Where:
m = slope c = interceptThe linear equation that represents the amount that Alex earns is y = 20x. This means that for every hour worked, Alex earns $20. Looking at the table, Sam earns $18 for every hour worked. This can be represented with the equation : y = 18x
The difference in the amount earned = 20 - 18 = $2
To learn more about linear functions, please check: https://brainly.com/question/26434260
#SPJ1
If the y intercept is 4, the x coordinate is 4 and the y coordinate is 12, what is the gradient
the slope goes by several names
• average rate of change
• rate of change
• deltaY over deltaX
• Δy over Δx
• rise over run
• gradient
• constant of proportionality
however, is the same cat wearing different costumes.
[tex]\stackrel{ y-intercept }{(\stackrel{x_1}{0}~,~\stackrel{y_1}{4})}\qquad (\stackrel{x_2}{4}~,~\stackrel{y_2}{12}) ~\hfill \stackrel{slope}{m}\implies \cfrac{\stackrel{\textit{\large rise}} {\stackrel{y_2}{12}-\stackrel{y1}{4}}}{\underset{\textit{\large run}} {\underset{x_2}{4}-\underset{x_1}{0}}} \implies \cfrac{ 8 }{ 4 } \implies 2[/tex]
help me with this question please
Answer:
2.50 p + 1.50p
Step-by-step explanation:
if you buy an item x amount of times you would times the two to figure out the total cost of that type of item then add with the other
To raise money for charity, Monica and her friends start the Pampered Pooch Pet Wash. The first day they are open, they forget to put up posters and only raise a little money. The next day, they hang posters all over the neighborhood and raise $55.50. In all, Monica and her friends raise $65.50 on the first two days they are open. Which equation can you use to find the amount of money a Monica and her friends raise on the first day?
55.50a = 65.50
a + 55.50 =65.50
a - 65.50 = 55.50
a - 55.50 =65.50
Answer:
Step-by-step explanation:
[tex]a[/tex] is the amount earned on the first day.
She earnt $[tex]$a[/tex] dollar on day 1, $55.50 on day 2, and $65.50 total in the 2 days.
So we get
[tex]a+55.50=65.50[/tex]
Conner worked on Monday, M, and Friday, F, for a total of 12 hours. He charges $5 per hour on Monday and $8 per hour on Friday. If the total amount Conner received was $81, how many hours did he work on Monday
Conner worked 5 hours on Monday.
Let's use the letters "m" and "f" to denote the number of hours Conner worked on Monday and Friday, respectively.
Conner worked a total of 12 hours, and since we know this from the issue statement, we may write:
m + f = 12
Also, we are aware that Conner received $81 and charged $5 on Mondays and $8 on Fridays. Hence, we can write:
5m + 8f = 81
To determine one of the variables in terms of the other, we can utilise the first equation. To solve for "f," we obtain:
f = 12 - m
We can now solve for "m" by substituting this expression for "f" in the second equation:
5m + 8(12 - m) = 81
After simplifying and finding "m," we obtain:
5m + 96 - 8m = 81
-3m + 96 = 81
-3m = -15
m = 5
Conner spent 5 hours at work on Monday as a result.
To know more about equation visit:
https://brainly.com/question/25976025
#SPJ9