Question 1

The cost, in dollars, of filling your gas tank is directly proportional to the price per gallon of gas. If 8 gallons of gas costs $10.00, how much would 11 gallons cost?

Accepted Answer

A) $15.00 
B) $11.25 
C) $13.75 
D) $13.00

Question 2

Plot each of the following points on the same set of axes.

Accepted Answer

The answer of Plot each of the following points on...

Question 3

Graph the line by making a table of ordered pairs and plotting the points.
y = 5x - 10

Accepted Answer

The answer of Graph the line by making a table...

Question 4

Solve the system using the substitution method.

Accepted Answer

The answer of Solve the system using the substitution method....

Question 5

Plot each of the following points on the same set of axes.

Accepted Answer

The answer of Plot each of the following points on...

Question 6

The following table shows the cost of renting a full-size rental car, based on the number of miles
driven.  
a. Explain why a linear equation is appropriate for this relationship.
b. Find the slope of the line and explain what it means.
c. Find the y-intercept and explain what it means.
d. Determine the equation of the line.
e. Is this a direct variation relationship? Why or why not? Be specific.
f. I am trying to decide whether I can afford to rent a full-size car to drive to St. Louis, which is about 180
miles away. How much would that cost for a one-way trip? How much would it cost for a round trip of 360
miles?
g. Why doesn't the round trip cost twice as much as the one-way trip? Be specific.

Accepted Answer

The answer of The following table shows the cost of...

Question 7

Mountain climbers use a general rule of thumb which estimates that the temperature will drop 3.5 degrees Fahrenheit for every 1000 ft of elevation. 
 b. Find the slope of the line and explain what it means.
c. Find the y-intercept and explain what it means.
d. Write the equation of the line.
e. Restate your equation in the form of a sentence: "If x represents …, then y = … represents …"
f. Use your equation to find the temperature at 10,000 ft.

Accepted Answer

The answer of Mountain climbers use a general rule of...

Question 8

The table displays the number of women in the US House of Representatives for selected years from 1980 through 2008.  
a. Use your calculator to determine the line of best fit for these data, where x is the number of years since 1980. Round all coefficients to 4 decimal places.
b. What is the correlation coefficient, r? What does it mean about whether this line is a good fit for these data? Explain.
c. Give the slope of the line and explain what it means.
d. Use this equation to predict the number of women in the House of Representatives in the year 2013.

Accepted Answer

The answer of The table displays the number of women...

Question 9

Graph the line by making a table of ordered pairs and plotting the points.

Accepted Answer

The answer of Graph the line by making a table...

Question 10

The following table reports the number of yellow fever cases reported in Ghana for the years 1992-2004 (after the start of mass immunization).  b. What trends do you see? Be specific.

Accepted Answer

The answer of The following table reports the number of...

Question 11

Solve the system using the substitution method.

Accepted Answer

The answer of Solve the system using the substitution method....

Question 12

Find the slope of the line that passes through the points (-8, 2)and (-12, 2).

Accepted Answer

A) m = -4 
B) undefined 
C) m = 0 
D) m = 1.4

Question 13

Find the slope and y-intercept.

Accepted Answer

The answer of Find the slope and y-intercept. ...

Question 14

Which of the following graphs shows the correct location of the point (-3, 4)?

Accepted Answer

The answer of Which of the following graphs shows the...

Question 15

Write an equation of the line with slope  and  y -intercept

Accepted Answer

A)  
 
B)  
 
C)  
 
D)

Question 16

B  varies directly as  m  and inversely  n . B=36  when  m=54  and  n=9 , find  B  when  m=  7 and  n=5 .

Accepted Answer

A)  
 
B)  
 
C)  
 
D)

Question 17

Graph the line by making a table of ordered pairs and plotting the points.
-27y = 14x

Accepted Answer

The answer of Graph the line by making a table...

Question 18

Graph the line through the point (-1, 3) having slope -2.

Accepted Answer

A)  
 
B)  
 
C)  
 
D)

Question 19

Complete the table of points for the equation y = x - 7.

Accepted Answer

The answer of Complete the table of points for the...

Question 20

L  varies jointly as  a  and the square root of  b . If  L=160  when  a=5  and  b=16 , find  L  when  and  b=144 .

Accepted Answer

A)   L=384 
B)   L=32 
C)   L=4 
D)   L=96

Exam 3: Thinking Linearly

The cost, in dollars, of filling your gas tank is directly proportional to the price per gallon of gas. If 8 gallons of gas costs $10.00, how much would 11 gallons cost?

Plot each of the following points on the same set of axes.

Graph the line by making a table of ordered pairs and plotting the points. y = 5x - 10

Solve the system using the substitution method.

Plot each of the following points on the same set of axes.

Graph the line by making a table of ordered pairs and plotting the points.

The following table reports the number of yellow fever cases reported in Ghana for the years 1992-2004 (after the start of mass immunization). b. What trends do you see? Be specific.

Solve the system using the substitution method.

Find the slope of the line that passes through the points (-8, 2) and (-12, 2) .

Find the slope and y-intercept.

Which of the following graphs shows the correct location of the point (-3, 4)?

Write an equation of the line with slope and y -intercept

B varies directly as m and inversely n . B=36 when m=54 and n=9 , find B when m= 7 and n=5 .

Graph the line by making a table of ordered pairs and plotting the points. -27y = 14x

Graph the line through the point (-1, 3) having slope -2.

Complete the table of points for the equation y = x - 7.

L varies jointly as a and the square root of b . If L=160 when a=5 and b=16 , find L when and b=144 .