Proportional Relationships

You spend $40 on 5 pounds of concrete. What is the unit rate in dollars per pound?

• $8 per pound
• $5 per pound
• $35 per pound
• 0.125 pounds per dollar

If Justin can type 408 words in 4 minutes, how many words can he type per minute?

• 102 words per minute
• 100 words per minute
• 400 words per minute
• 412 words per minute

A sixth-grade math teacher can grade 25 homework assignments in 20 minutes. Is he working at a faster rate or slower rate than grading 36 homework assignments in 30 minutes?

• Slower rate
• Faster rate
• He didn't grade them
• Everyone got 100

The cost of 4 golf balls is $10. How much would it cost for 20 golf balls?

• $10 for 20 golf balls

• $20 or 20 golf balls

• $40 or 20 golf balls

• $50 or 20 golf balls

If a dozen doughnuts cost $3.00, what would 1 doughnut cost?

• 1 doughnuts would cost $0.15

• 1 doughnuts would cost $0.25

• 1 doughnuts would cost $0.30

• 1 doughnuts would cost $1.15

Which is the better buy?

• A 4 pack of t-shirts for $2.24

• A 6-pack of t-shirts for $3.12

• An 8 pack of t-shirts for $4.24

Is this graph proportional?

• Yes
• No

What does k represent in the equation y = kx?

• constant for preparation
• constant of proportionality
• kangaroos
• krispy kreme

In the equation y = 14x, what is the constant of proportionality?

• y
• x
• 14
• 1/14

Does this equation represent a proportional relationship?

• Yes
• No