Explain the Meaning of the Function Notation

A plant's height is a function of the time it has grown. Time is measured in weeks. What does the notation h(4) = 5 mean?

• After 5 week the plant is 4 inches tall
• The plant grows at a rate of 5/4 inch per week
• After 4 weeks the plant is 5 inches tall
• The plant grows at a rate of 1 inch per week

The speed of the baseball is a function of the time since the baseball was hit by a bat. What does f(2) = 80 represent in this situation?

• After 2 seconds the baseball is traveling at 80mph

• After 80 seconds the baseball is traveling at 2mph

• The baseball traveled 80mph for 2 seconds

• The baseball traveled 2mph for 80 seconds

The function R represents the rain total rainfall, in cm, after x hours. The graph of the function is shown.

Interpret the meaning of R (1.5) = 3

• After 1.5 hours, 3 cm of rain has fallen.

• After 3 hours, 1.5 cm of rain has fallen.

• After 1.5 hours, 1.5 cm of rain has fallen.

• After 3 hours, 3 cm of rain has fallen.

A babysitter's salary can be represented by a function, S, where the input is the hours worked.

What does S(7) represent?

• The salary of a babysitter who worked 7 hours.

• The hours worked if the salary is $7.

• The salary of a babysitter who worked 0 hours.

• The hours worked if the salary is $0.

Function F shows the distance a car traveled after h, hours. The graph is shown.

Estimate F(6) and explain its meaning.

• 240;

  240 miles were traveled after 6 hours.

• 240;

  240 hours passed after 6 miles were driven.

• 320;

  320 miles were traveled after 6 hours.

• 320;

  320 hours passed after 6 miles were driven.

What is f(4) for this graph?

• 0

• 1

• -4

• 4

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

• 4
• 0
• 3
• 8