Unit 3 Proportional Reasoning Review

A movie theatre has increased their ticket prices. Based on the graph, what is the constant of proportionality?

• y = 12x

• y = 0.83x

Which of the following vocabulary words mean the same thing as constant of proportionality? Check all that apply.

• Unit Rate

• Constant rates of change

• Ratio

• Equation

Which equation is true?

• $x=ky$
  

• $y=kx$
  

• $k=\frac{x}{y}$

• $k=yx$

A wise financial principle states that no more than 30% of your income should be your rent. Which equation can be used to find x, the amount Emilio should spend on rent if he brings home $2,000 per month?

• $\frac{30}{100}=\frac{2000}{x}$

• $\frac{30}{2000}=\frac{100}{x}$

• $\frac{2000}{100}=\frac{30}{x}$

• $\frac{30}{100}=\frac{x}{2000}$

A gear rotates 6 times every 15 seconds.

Based on this information, which of the following

could NOT be true?

• The gear rotates 30 times in 90 seconds.

• The gear rotates 24 times in one minute.

• The gear rotates 18 times in 45 seconds.

• The gear rotates 12 times in 30 seconds.

Find the missing value.

 $\frac{16}{20}=\frac{x}{100}$  

Percent means...

• out of 100

• out of 10

A dolphin jumps 54 times in a 6 hour period. At this rate, how many jumps would be expected in a 2 hour period?

• 18

• 9

• 12

• 62

How do you solve this question:

A package of 12 cans of black beans cost $6.84. What is the cost of one can of black beans?

• $6.84\div12$

• $12\div6.84$

• $12\cdot6.84$

• $12-6.84$

Mary decreased her time for the mile walk from 30 minutes to 24 minutes. What was the percent of decrease?