Function Notation to Describe Rules

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Match each equation with a description of the function it represents.

• 3: To get the output, multiply the input by 2, then add 4 to the result.

• 1: To get the output, add 4 to the input, then multiply the result by 2.

Is this a function?

• Yes

• No

• I'm Confused

• May I phone a friend?

Identify the function rule that best represents the following statement:
The base price (P) of a pizza is $4.99 plus an additional $0.95 for each topping (t).

• P = 4.99 - 0.95t

• P = 4.99 + 0.95t

• P = 5.94t

• t = 4.99P + 0.95

A plumber charges a service fee of $40 plus $25 per hour for labor.
Write a function rule for the total cost of hiring the plumber for a job that takes x hours.
How much would it cost to hire the plumber for a job that takes 4 hours?

• y = 40 + 25x
  $140

• y = 40x + 25
  $185

• y = 40 + 25x 
  $185

• y = 40x + 25 
  $140

Write a function rule for the statement:

The output is double the input.

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The output is eight less than the input.

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The cost, c, of attending a basketball tournament with your team this summer is $75 for the registration and $125 for everyday, d, that you stay in the hotel. Write a function rule that represents the total cost of attending the tournament.

Your parents bought you a $100 gift card from the game store. Each game cost $5. Write an function rule that represents the balance b after purchasing games g.

• b = 100 - 5g

• b = 100 + 5g

• b = 105g

• b = 100