2 x – 3 y = 7
–4 x + y = –5
What is the x -value of the solution to this system of equations?

The length of NQ for this problem is given as follows:

NQ = 5.

In this problem, we have two similar triangles, meaning that their side lengths are proportional.

The lengths for this problem are given as follows:

The similar triangles are given as follows:

PQR and PNO.

The equivalent side lengths are given as follows:

Hence the proportional relationship is given as follows:

5/(5 + x) = (x - 1)/8

Applying cross multiplication, we have that:

(x + 5)(x - 1) = 40

x² + 4x - 5 = 40

x² + 4x - 45 = 0.

Hence:

(x + 9)(x - 5) = 0.

The positive solution is:

x - 5 = 0

x = 5.

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The correct answer is OB. The statement does not make sense as a and b are real numbers in the imaginary number of the form a + bi. Hence, the imaginary numbers are defined and interpreted in the set of real numbers also.

Imaginary numbers are defined as the set of numbers of the form a + bi, where a and b are real numbers and i is the imaginary unit.

It is a mathematical concept that extends the real numbers system, by introducing a new number i which is defined as the square root of -1. It allows us to solve equations which are not solvable in real numbers.

The word "imaginary" is used to denote the presence of the imaginary unit i, which is not a real number but is used to extend the real numbers. It does not mean that these numbers are undefined.

Hence, the statement "The word imaginary in imaginary numbers tells that these numbers are undefined" is not true, as the imaginary numbers are defined and interpreted in the set of real numbers also.

In summary, the statement is not making sense as the imaginary numbers are defined in the set of complex numbers.

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The word problem "8 times the sum of 2 and a number" is equal to 8(2 + n).

In Mathematics, an algebraic expression simply refers to a mathematical equation that can be used for showing the relationship which exist between two (2) or more variables, numerical quantities, as well as in conjunction with different mathematical operations.

Assuming the variable n represents the unknown numerical value (number), we would translate the word problem into an algebraic expression as follows;

Algebraic expression = 8 × (2 + n)

Algebraic expression = 8(2 + n).

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The answers for the given units are 1 g = 0.001 kg; 1 m = 1000 mm; 1 cm = 10 mm; 1 dL = 100 mL; 1 kg = 1000 g; 1 pg = 1 × 10⁻¹² g; 1 g = 1 × 10¹² pg; and 1 mL = 1 cc.

A unit is a name given to a known quantity that is used to measure something. A gram is one-thousandth of a kilogram used to measure weight. This is written as 1 g = 0.001 kg or 10⁻³ kg and kg to g is written as 1 kg = 1000 g. In terms of their relationship, 1 m and 0.001 mm are equivalent. This is written as 1 m = 1000 mm or 10³ mm. The relationship between millimeters and centimeters is written as 1 cm = 10 mm.

Over a milliliter, a deciliter is greater. This is written as 1 dL = 100 mL. The relationship between picogram and gram is written as 1 pg = 1 × 10⁻¹² g

and 1 g = 1 × 10¹² pg. The relationship between a milliliter and a cubic centimeter is written as 1 mL = 1 cc.

The required answers are

1 g = 0.001 kg

1 m = 1000 mm

1 cm = 10 mm

1 dL = 100 mL

1 kg = 1000 g

1 pg = 1 × 10⁻¹² g

1 g = 1 × 10¹² pg

1 mL = 1 cc

The complete question is -

Select the correct prefix to complete the equality. Drag the appropriate labels to their respective targets. Note: not all labels will be used.

1 g = -----kg

1 m = -----mm

1 cm = ----- mm

1 dL = ----- mL

1 kg = ----- g

1 pg = ----- g

1 g = ----- pg

1 mL = ----- cc

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a. The frequency which she hears is 440Hz.

b. The person in the car would hear a frequency of 391.98 Hz when the ferry leaves the dock and heads directly away from the driver.

(a) The frequency that the person in the car hears is affected by the motion of the car and the sound source (the ferry). The effect is called the Doppler effect, which causes the perceived frequency of sound to change depending on the observer and the relative motion of the source.

If the car is moving toward the ferry, the frequency will be higher than the actual frequency of the sound. The perceived frequency is given by the formula:

f' = f (v + v_s) / (v + v_s)

where

f = the actual frequency of the sound (400 Hz)

v = the velocity of sound (approximately 340 m/s)

[tex]v_s[/tex] = the velocity of the car (60 km/h = 16.67 m/s)

So,

f' = 400(340 + 16.67) / (340 - 16.67) = 400(356.67) / 323.33 = 440 Hz

Hence, the frequency which she hears is 440Hz.

(b) The perceived frequency when the ferry leaves the dock and heads directly away from the driver is also affected by the Doppler effect.

f' = f (v - v_s) / (v - v_s)

where

f = the actual frequency of the sound (400 Hz)

v = the velocity of sound (approximately 340 m/s)

v_s = the velocity of the ferry (15 km/h = 4.17 m/s)

So,

f' = 400(340 - 4.17) / (340 + 4.17) = 400(335.83) / 344.17 = 391.98 Hz

The person in the car would hear a frequency of 391.98 Hz when the ferry leaves the dock and heads directly away from the driver.

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Answer:

Step-by-step explanation:

Option (d) is the correct answer i.e. that hyperbola has both vertices in the same quadrant.

A hyperbola is a conic section in analytical geometry that is formed when a plane intersects a double right circular cone at an angle that spans both cone halves.

Let's see each option one by one:

(a) We've a = 11 and b = 10

   This hyperbola is centered at (-10,3) and has vertices as (1,3) and (-21,3).

So, both vertices are not in the same quadrant.

(b) We've a = 9 and b = 12

   This hyperbola is centered at (-6,8) and has vertices as (-6,17) and (-6,-1).

So, both vertices are not in the same quadrant.

(c) We've a = 12 and b = 8

   This hyperbola is centered at (1,11) and has vertices as (13,11) and (-11,11).

So, both vertices are not in the same quadrant.

(d) We've a = 9 and b = 11

   This hyperbola is centered at (-1,10) and has vertices as (-1,19) and (-1,1).

So, both vertices in the same quadrant.

Hence, option (d) is the correct answer.

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The sequence of transformation which includes a reflection and a translation that maps triangle ΔABC to ΔA'B'C' are;

A reflection transformation is one in which the mirror image of the figure is produced, on the other side of a line known as the line of reflection.

The vertices of the triangle ΔABC are A(-1, 2), B(-2, 5), C(-5, 1), the vertices of triangle ΔA'B'C' are A'(3, -2), B'(4, -5), C'(7, -1)

A reflection of the triangle ΔABC across the y-axis, we get;

A''(1, 2), B''(2, 5), C''(5, 1)

A reflection of the triangle ΔA'B'C', across the x-axis produces;

A'''(3, 2), B'''(4, 5), C'''(7, 1)

The rule that maps the coordinates of the vertices of ΔA''B''C'' to the coordinates of the vertices of ΔA'''B'''C''' is a translation of triangle 2 units to the right,

Therefore, the sequence of transformation that maps ΔABC to ΔA'B'C' are;

A reflection across the y-axis, followed by ⇒A translation of two units to the right, then ⇒ A reflection across the x-axis.

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The distance of the line segment joining the two points is [tex]2\sqrt{2}[/tex].

The shortest distance (length of the straight line segment's length connecting both given points) between points ( p,q) and (x,y) is:

[tex]D = √[(x-p)² + (y-q)²] D = \sqrt{(x-p)^2 + (y-q)^2} \: \rm units.[/tex]

Given;

The two points;

(2,0) (0,-2)

Now,

D=[tex]\sqrt{(0-2)^2+(-2-0)^2}[/tex]

=2[tex]\sqrt{2}[/tex]

Therefore, the distance between two points will be 2[tex]\sqrt{2}[/tex]

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d = 4

b = -3. c = 1

a = 3 and d = 1

What are three polynomials factorized below?

To get the missing values in the table, we will factorize the given expression and compare the factored expression with the expression containing the missing constants.

1) For the expression x²+2x-8, on factorizing we have;

x²+2x-8

= (x²+4x)-(2x-8)

Factoring out the common terms from both parenthesis;

= x(x+4)-2(x+4)

= (1x+4)(1x-2)

=  (1x-2)(1x+4)

Comparing the resulting expression with (ax+b)(cx+d)

a = 1, b = -2, c = 1 and d = 4

2) For the expression 2x³+2x²-24x

Factoring out the common term we will have;

= 2x(x²+x-12)

= 2x(x²-3x+4x-12)

= 2x{x(x-3)+4(x-3)}

= 2x{(x+4)(x-3)}

=  2x(1x-3)(1x+4)

Comparing the resulting expression with 2x(ax+b)(cx+d)

a = 1, b = -3. c = 1 and d = 4

3) For the expression 6x²-15x-9 we will have;

On simplifying,

= 6x²+3x-18x-9

= 3x(2x+1)-9(2x+1)

= (3x-9)(2x+1)

Comparing the resulting expression with (ax+b)(cx+d)

a = 3, b = -9, c = 2 and d = 1

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1. Yes. A dilation is performed on the figure. The ratio of the two figures is same. 2. No. The ratios of the sides of the figures are not equal and no transformation is applied.

The transformation, or f: X X, is the name given to the function, f, that maps to itself. After the transformation, the pre-image X becomes the picture X. Any operation, or a combination of operations, such as translation, rotation, reflection, and dilation, can be used in this transformation. A function can be moved in one way or another using translation, rotation, reflection, and dilation. A function can also be scaled using rotation around a point. Two-dimensional mathematical figures move about a coordinate plane according to transformations.

1. Yes. A dilation is performed on the figure. The ratio of the two figures is same.

2. No. The ratios of the sides of the figures are not equal and no transformation is applied.

3. Yes. A translation is performed on the figure to shift the transformation with 2 units.

4. No. The ratios of the sides of the figure are not same.

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If f(-8) = 1, then the point (-8, 1) is on the graph of f.

The numeric value of the function at x = -8 is given as follows:

f(-8) = 1.

The format of each point on the coordinate plane is given as follows:

(x,y).

In which y is the numeric value of the function at x, meaning that the point can also be written as follows:

(x, f(x)).

Considering that when x = -8, f(x) = 1, the point is given as follows:

(-8,1).

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we conduct a one-sided test on the statistic one tail of a critical area of distribution.

The critical value for a two-tailed test of h0: β1 = 0 at α = .05 in a simple regression with 22 observations is 4.35.

What is a critical value?

A critical value can be calculated for different types of hypothesis tests. The critical value of a particular test can be interpreted from the distribution of the test statistic and the significance level.

Test of significance of linear regression between x and y.

Null hypothesis: There is no significant linear relationship between x and y.

Alternative hypothesis: There is a significant linear relationship between x and y.

Test statistic:

F0 = Mean square due to regression/  mean squared error ~ F(1, n-2)

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There are 16128 ways to form the committee when 2 of the men refuse to serve together, 23040 ways to form the committee when 2 of the women refuse to serve together, and 5040 ways to form the committee when 1 man and 1 woman refuse to serve together.

(a) When two of the men refuse to serve together, there are 6 men to choose from for the first 3 positions, 4 for the next, and 2 for the last. So there are 6 × 4 × 2 = 48 ways to choose the 3 men.

There are 8 women to choose from for the first 3 positions, so there are 8 × 7 × 6 = 336 ways to choose the 3 women. Thus there are 48 × 336 = 16128 ways to form the committee when 2 of the men refuse to serve together.

(b) When two of the women refuse to serve together, there are 8 women to choose from for the first position, 6 for the next, and 4 for the last. So there are 8 × 6 × 4 = 192 ways to choose the 3 women.

There are 6 men to choose from for the first 3 positions, so there are 6 × 5 × 4 = 120 ways to choose the 3 men. Thus there are 192 × 120 = 23040 ways to form the committee when 2 of the women refuse to serve together.

(c) When 1 man and 1 woman refuse to serve together, there are 7 women to choose from for the first 3 positions and 6 men to choose from for the last 3 positions.

So there are 7 × 6 × 5 × 4 × 3 = 5040 ways to form the committee when 1 man and 1 woman refuse to serve together.

The answer to each of the questions is the number of different committees that can be formed under the given conditions.

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--The given question is incomplete; the complete question is

"From a group of 8 women and 6 men, a committee consisting of 3 men and 3 women is to be formed. How many different committees are possible if (a) 2 of the men refuse to serve together? (b) 2 of the women refuse to serve together? (c) 1 man and 1 woman refuse to serve together?"--

Each one of the given ratios should be expressed in its simplest form as follows:

In Mathematics, a ratio can be defined as a mathematical expression that's used to denote the proportion of two (2) or more quantities with respect to one another and the total quantities.

In this exercise, you are required to express each of the given ratios in its simplest form. Therefore, we would divide both sides of the ratio by highest common factor (HCF) as follows;

50:150 = 50/150 = 1/5 = 1:5. (divide both sides by 50).

25:40 = 25/40 = 5:8. (divide both sides by 5).

33:99 = 1:3. (divide both sides by 33).

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Complete Question:

Express each one of the following ratios in its simplest form.

(i) 50: 150

(ii) 25:40

(iii) 33 : 99​

Exactly two of the students are guilty. This can be deduced by looking at the facts given and understanding that if A is not guilty, then both B and C are guilty, while either B is not guilty or C is not guilty. This implies that exactly two of the students are guilty.

Given the three facts, we can determine that either A or B is guilty, but not both, and C is guilty. This means that exactly two of the students are guilty.

Since the statement either A is not guilty, or B is guilty, and the statement either B is not guilty, or C is not guilty, both cannot be true. This means that exactly two of the students are guilty.

Given the three facts, we can determine that either A or B is guilty, but not both, and C is guilty. This means that exactly two of the students are guilty. Since the statement either A is not guilty, or B is guilty, and the statement either B is not guilty, or C is not guilty, both cannot be true. This means that only one of the three is not guilty and it is not A or B. Therefore, exactly two of the students are guilty. This can be deduced by looking at the facts given and understanding that if A is not guilty, then both B and C are guilty, while either B is not guilty or C is not guilty. This implies that exactly two of the students are guilty.

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Answer:

Step-by-step explanation:

B. $342.95 is your answer

The type of slope for each function is given as follows:

Zero, Positive, Positive, Undefined.

There are four types of lines, and their slopes are classified as follows:

There is a mistake in the options or in the graph, as both graphs b and c are increasing lines.

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the relationship between the monthly rent (p) and the demand (x) is p(x) = -15x + 1560.

A real estate office handles an apartment complex with 80 units. When the rent per unit is $360 per month, all 80 units are occupied. However, when the rent is $405per month, the average number of occupied units drops to 77. Assume that the relationship between the monthly rent (p) and the demand (x) is linear.

Since the equation will be linear, we only need two coordinates to write the equation.

They are given, we can assign the values x = no.of units and y = rent:

x1 = 80, y1 = 360

and

x2 = 77, y2 = 405

Find the slope: m = (y2-y1)/(x2-x1)

m = (405-360)÷(77-80) = 45÷(-3)= -15

The slope m= -15

A) Write the equation of the line giving the demand (x) in terms of the rent (p)

Use the point/slope equation.

Using the point/slope formula: y - y1 = m(x - x1)

y - 360= -15(x - 80)

y - 360 = -15x + 1200

y = -15x + 1200 + 360

y = -15x + 1560

or

p(x) = -15x + 1560

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Answer:

see below

Step-by-step explanation:

S+L = 22

L=2+3S

so S+2+3S =22

4S=22-2 = 20

S =5

L =17

Answer:

Step-by-step explanation:

Answer:

0 > x

Step-by-step explanation:

The open circle indicates that x cannot be equal to zero, which rules out the last two options. Since the line is going to the right (towards numbers greater than 0), x must be greater than zero, which means that the first option is correct.

Answer:

x > 0

Step-by-step explanation:

we see the blue line. it covers everything that is larger than 0.

the dot on 0 is empty, which indicates that the point (here 0) itself is not included.

therefore, the second answer option (x > 0) is correct.

Answer: Because instead it equals 0.005

Step-by-step explanation:

The reason 5/100 is not equal to 0.5 is that they are written in different forms.

5/100 is written in the form of a fraction, where the numerator (5) represents the number of parts out of a whole, and the denominator (100) represents the total number of parts in the whole. So, 5/100 represents 5 parts out of 100 parts, which is equal to 0.05.

On the other hand, 0.5 is written in decimal form. It represents the number of parts out of 1, where the digits to the right of the decimal point represent the number of tenths, hundredths, thousandths and so on. So, 0.5 represents 5 tenths, or 5 parts out of 10 parts.

In conclusion, while they represent the same value, they are written in different forms and it's important to know how to read and convert them correctly.

The solution to the equation is x = 7.

What is the linear equation in one variable?

A linear equation in one variable is an equation of the form ax + b = 0, where a and b are constants and x is the variable. The general form of a linear equation in one variable is ax + b = 0, where a and b are constants and x is the variable. The graph of a linear equation in one variable is a straight line.

The first step in solving the equation 2x - 4 = 10 using algebra tiles would be to add 4 to both sides of the equation to get 2x = 14. The next step would be to divide both sides of the equation by 2 to get x = 7.

Hence, the solution to the equation is x = 7.

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Answer: To find the distance Alexandria is from her starting point, you can use the Pythagorean theorem.

The theorem states that in a right triangle, the square of the hypotenuse (the distance between the starting point and the final point) is equal to the sum of the squares of the other two sides (the distance traveled north or south and the distance traveled east or west).

In this case, the distance traveled north or south is 480 meters (the distance traveled due south) and the distance traveled east or west is 427 meters (the distance traveled due east) - 171 meters (the distance traveled due west) = 256 meters.

So, using the Pythagorean theorem:

Distance = √(480^2 + 256^2)

Distance = √(230400 + 65536)

Distance = √(295936)

Distance = 544.98 meters

So Alexandria is 544.98 meters away from her starting point.

Step-by-step explanation:

Answer:

24 workers

Step-by-step explanation:

solution

A wall can be built in 48 hrs by = 15 workers

A wall can be built in 1 hr by = 15× 48 workers

A wall can be built in 30 hrs by= 15 × 48/ 30 workers

= 24 workers

The exact value of cot A is .20/21

The denominator means moving the radical term square root or cube root to the numerator such that a denominator is a whole number.

We have been given that sin( A ) = 21/29 and angle A is in quadrant 1. We are asked to find the exact value of  cot (A) in simplest radical form.

We know that sine relates opposite side of right triangle with hypotenuse.

Since = opposite

            hypotenuse

This means that opposite side is 21 units and hypotenuse is 29 units.

We know that cotangent relates adjacent side of right triangle with adjacent side.

Cot = Adjacent

         opposite

Now we will find adjacent side using Pythagoras theorem as:

Adjacet² = hypotenuse² - opposite²

Adjacent² = 29² - 21²

Adjacent² = 841 - 441

Adjacent² =400

Let us take positive square root on both sides:

√Adjacent² = √400

 Adjacent = 20

Therefore, adjacent side of angle A is 20 units.

Cot (A) = 20/21

The exact value of cot A is .20/21

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The area of the major sector in the given diagram is 115.5 sq.unit.

The region having a greater area is known as Major Sector while the one which has a smaller area is the minor sector.

A sector with a central angle greater than 180° is called a major sector and the formula is given below:

/360° ₓ r²

The radius is 7m and is 270°

Therefore 270/360 × 3.142 × 7² =  115.5sq.unit.

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Using the arithmetic operation of multiplication, two cities having a distance of 2.5 inches on map have an actual distance of 50 miles.

What is arithmetic operation?

A subject of mathematics known as arithmetic operations deals with the study and use of numbers in all other branches of mathematics. Basic operations including addition, subtraction, multiplication, and division are included.

The value of 1 inch on scale = 20 miles.

The distance between two cities on map = 2.5 inches

To find the distance between two cities in actual use the arithmetic operation of multiplication.

Let the original distance value in miles be x.

The equation for distance will be -

x = 2.5 × 20

Solve the equation -

x = 2.5 × 20

x = 50

Therefore, the actual distance in miles is 50 miles.

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+4.533 is the percent error for the company's estimate

A value or ratio that may be stated as a fraction of 100 is referred to as a percentage in mathematics. If we need to compute a percentage of a number, we should divide it by its whole and then multiply it by 100. The proportion, therefore, refers to a component per hundred. Per 100 is what the term percent signifies. The letter "%" stands for it.

Given, Bay City Balloons studied the demand in Bay City before opening a hot air balloon company. The owners expected to book 375 hot air balloon rides in their first ninety days of business. Instead, they booked 392 rides in that period.

Since percentage error:

Percent error is the difference between the estimated value and the actual value in comparison to the actual value and is expressed as a percentage. In other words, the percent error is the relative error multiplied by 100.

Thus in our case

Percentage error = ((392 - 375)/ 375) * 100

Percentage error = 4.533

therefore, the percent error for the company's estimate is +4.533.

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