Unit 3 Midway Summative Study Guide

The graph shows the amount Miguel saves in dollars, y, for each month, x. What is the unit rate (constant of proportionality)?

• $30 per month

• $60 per month

• $15 per month

• $10 per month

• 1

Five beach balls cost $17.50. The cost per ball is the same for any number of beach balls. If

this situation were graphed on a coordinate plane, which rate would be part of the

graph?

• 1 beach ball for $2.50

• 3 beach balls for $10.50

• 8 beach balls for $27.50

• 5 beach balls for $12.50

Tomas adds money to his savings account. Which graph shows a proportional

relationship between the amount of money in the account and the time in days?

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The table shows the distance, d, that a model train travels over time, t. Which equation represents the relationship of distance, d, and time, t?

Amy is buying coffee. The graph shows the cost in dollars, y, for the number of pounds of coffee, x, she buys.

Which of the statements is true about the point (1, 3) in this context?

• The cost for three pounds of coffee is $3

• The cost for 1 pound of coffee is $1

• The cost for 1 pound of coffee is $3

• The cost for 3 pounds of coffee is $1

If the scale of the drawing is 1 inch: 2.5 feet, what is the actual area of the bedroom in square feet? Only enter the number.

What is the length of the missing side, a? Enter the number only.

A satellite is 15 meters wide. A model of it was built with a scale of 1 centimeter : 5 meters.

How wide is the model?

• 3 centimeters

• 3 meters

• 75 centimeters

• 75 meters