Function Rules

Patrick earns $20 for every lawn that he mows. Write an equation used to find t, the total amount of money he earns from mowing n lawns.

• n = 20t
• t = 20n
• t = n + 20
• t = n - 20

Tags

CCSS.6.EE.C.9

A pizzeria charges $12 per pizza plus an additional $3 for delivery. Which equation represents the cost of having any number of pizzas delivered?

• c = 12p + 3
• c = 12p
• c = 3p
• c = 12 + 3p

Tags

CCSS.HSF-BF.A.1A

The output is four times the input.

• y = x/4
• 4x
• y = 4x
• y = x +4

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

Find the function rule.

• y = 2x

• y = 2x+3

• y = 3x+3

• y = -2x+3

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

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

• (A) y = 40 + 25x
  (B) $140
• (A) y = 40x + 25
  (B) $185
• (A) y = 40 + 25x 
  (B) $185
• (A) y = 40x + 25 
  (B) $140

Tags

CCSS.HSF-BF.A.1A