Ratios, Rates and Proportional Relationships

Write an equation for this relationship if d represents number of days and c represents total cost.

• d=18.50c

• c=18.50d

• c=22.50d

• c=22d

Does the graph represent a proportional relationship?

• Yes

• No

A cellphone company charges $90 for 2 months of service. What would be the equation that represents this relationship?

• y=90x

• y=180x

• y=45x

Solve for x 

• x = 6

• x = 25

• x = 28

• x = 17

• 4:1

• 9:1

• 1:4

• 1:9

• 9:4

• 4:9

• 1:4

• 4:1

• The ratio of the elevation of town A to the elevation of Tessa's house if town A is 1,000 feet above sea level and Tessa's house is at 1,900 feet above sea level.

• The ratio of fiction books to the total amount of books if there are 10 nonfiction books and 9 fiction books on Mary's shelf.

• The ratio of red marbles to blue marbles from a bag containing 38 blue marbles and 22 red marbles.

• The ratio of days Sally went outside for recess to the days that she stayed inside if Sally has been in school for a total of 63 days and 33 days have been spent inside for recess.

• A and D

• B and D

• A and C

• B and C