Review for Unit 2: Proportional Relationships

The table shows how much a store charges for certain numbers of pencils. Based on the table, which equation could be used to calculate the cost, c, of any number of pencils, p?

• c = 0.09p

• c = 0.18p

• c = 0.54p

• c = 0.72p

Look at the lines in the grid. Which line represents a proportional relationship?

• line A

• line B

• line C

• line D

According to this graph, how fast is the train moving in miles per hour? (look for 1 hour)

• 150

• 300

• 450

• 600

The graph shows a proportional relationship between time and the total cost of a taxi ride. Which expression can be used to find the unit rate, in dollars, for a one-minute ride in a taxi? Hint: What ratio do we use for the unit rate?

• 12 divided by 18

• 18 divided by 3

• 9 divided by 6

• 6 divided by 3

A dry cleaning service's costs for cleaning shirts is shown in the graph. What is the meaning of the point (1,2) in terms of the context?

• the dry cleaning service charges $1 per shirt

• the dry cleaning service charges $2 per shirt

• the dry cleaning service charges $1 for 2 shirts

• the dry cleaning service charges $2 for 2 shirts

Which graph shows a proportional relationship between x and y?

• A

• B

• C

• D

The graph shows the number of inches of snow over the course of time. Which statement is NOT correct about the relationship shown in the graph?

• It is snowing at a steady rate.

• It is snowing at a rate of 1/2 inch per hour.

• The amount of snow is proportional to the time.

• The coordinate (2,1) indicates that it has snowed 2 inches in 1 hour.

Four customers at a gas station this morning each purchased the same type of gasoline. The table below shows the amounts of gasoline they purchased and the costs. Using the data in the table above, what is the constant of proportionality (k) that can be used to find the total cost, C, for n gallons of this type of gasoline?

• 7.5

• 0.25

• 4

• 225

Point M represents 3 miles per hour in the graph shown. What does Point N represent?

• a distance of 3 miles per 9 hours

• a distance of 9 miles per 3 hours

• a distance of 1/9 mile in 3 hours

• a distance of 1/3 mile in 9 hours

The distance a typical hummingbird flies is 5.0 meters every second. The graph below models this situation. What does Point J represent on the graph?

• The hummingbird flies a distance of 5 meters every 30 seconds.

• The hummingbird flies a distance of 6 meters every 30 seconds.

• The hummingbird flies a distance of 30 meters every 5 seconds.

• The hummingbird flies a distance of 30 meters every 6 seconds.