Interpreting Functions in Unit 3

What does an independent variable represent in a function?

• A variable that can only be used in mathematical functions

• A value that depends on another variable

• A variable that is always constant

• A value that stands alone and is not affected by other variables

In the bagel example, what does 'x' represent?

• The number of bagels purchased

• The price per bagel

• The total cost of the bagels

• The type of bagels purchased

How is the function for the total cost of bagels expressed?

• n(x) = x / 150

• n(x) = 150 * x

• n(x) = 150 / x

• n(x) = 150 + x

What is the total cost when 12 bagels are purchased?

• $18

• $180

• $150

• $12

In the coffee club example, what does the fixed cost of $15 represent?

• The discount on each cup

• The cost per cup of coffee

• The total cost for coffee per month

• The monthly membership fee

How is the monthly cost function for the coffee club expressed?

• b(x) = (15 + 2) / x

• b(x) = 2x - 15

• b(x) = 15x + 2

• b(x) = 15 + 2x

What is the total cost when 6 cups of coffee are purchased?

• $22

• $17

• $27

• $12

In the salary example, what does 'x' represent?

• The annual raise amount

• The total salary after 7 years

• The number of years worked

• The starting salary

How is Anna's salary function expressed?

• r(x) = 45000 - 5000x

• r(x) = 5000 + 45000x

• r(x) = 45000 + 5000x

• r(x) = 45000 / x + 5000

What will Anna's salary be after 7 years?

• $75,000

• $85,000

• $90,000

• $80,000