Function Notation Interpreting

The function C(x) = 25x + 50 represents the labor cost, in dollars, for Contractor A to build a deck, where x is the number of hours of labor.

Explain the meaning of C(2) = 100

• The labor cost for Contractor A is $100 for 2 hours.

• The labor cost for Contractor A is $2 for 100 hours.

• The labor cost for Contractor A is $25 for 2 hours.

• The labor cost for Contractor A is $100 for 25 hours.

A company is selling bubble gum.  The function g(x)=3x+4 tells the company how much to charge if someone buys x packages of bubble gum.  Find g(8) and tell what it means within the context of the problem.

• g(8)=8.  This means that after 8 packages of gum, the company makes $8.

• g(8)=42.  This means that 8 packages of gum costs $42.

• g(8)=28.  This means that 8 packages of gum costs $28.

• g(8)=24.  This means that 8 packages of gum costs $24.

What is x if
f(x) = -2?

• 4

• 0

• 3

• 8

g(x) = 3x + 1
g(2) = _______

• 6

• 7

• 8

• 9

f(x) = x² + 7
x(2) = ______

• 10

• 11

• 13

• 12

j(x) = 2x + 3
j(-1) = ______

• 1

• -1

• 5

• -5

How far did the car travel after 2 hours?

• 80 miles

• 160 miles

• 240 miles

• 320 miles

The height of water in a bathtub, w , is a function of time, t . Let P represent this function. Which statement in function notation matches this description: After 10 minutes, the height of the water is 4 inches.

• P (0) = 0

• P (4) = 10

• P (10) = 4

• P (20) = 0

The height of water in a bathtub, w , is a function of time, t . Let P represent this function.

Which statement in function notation matches this description: The height of the water is 10 inches after 4 minutes.

• P (0) = 0

• P (4) = 10

• P (10) = 4

• P (20) = 0

The height of water in a bathtub, w , is a function of time, t . Let P represent this function.

Which statement in function notation matches this description: After 20 minutes, the bathtub is empty.

• P (0) = 0

• P (4) = 10

• P (10) = 4

• P (20) = 0