Understanding linear functions

As the number of weeks increases, the number of books read increases by a factor of 9.

What equation represents the situation above? (b is books read, w is weeks)

• b = 9w

• w = 9b

• b = 9 + w

• w = 9 + b

The constant of proportionality is also the unit rate.

• True
• False

A study was conducted, contrasting the number of miles that were driven, and the number of accidents that occurred. It listed the correlation coefficient as -1.3. What conclusion can you draw?

• Any correlation coefficient below -1 indicates certainty, thus if you were to drive, you should avoid that area.

• The correlation is a low negative, meaning there is an unclear relationship between these variables.

• The correlation is a high negative, meaning there is a clear relationship between these variables.

• None can be drawn, because that is an invalid number.

Find the value of missing variable

7 miles in 2 hours; x miles in 6 hours

• x=21

• x=42

• x=14

• x=12

The variable used to show "Rate of Change"

Which of the following is equal to 3 x 5?

• 3 + 5

• 4 + 3

• 10 + 5

• 5 x 3

Is the following rate of change a percent increase or decrease?

87.5% to 36.2%

• Increase

• Decrease

What kind of correlation?

• Positive
• Negative
• No

The constant of proportionality and the slope are the same thing.

• True

• False

How many customers will they serve after 5 hours?

• 80

• 40

• 400

• 5