Functions Review

The function h(t) represents the height in inches of a plant after t 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

Evaluate f(-3)

• f(-3) = -3

• f(-3) = 0

• f(-3) = 2

• not enough information to give an answer

Evaluate f(8)

• f(8) = -3

• f(8) = 1

• f(8) = 0

• f(8) = -1

Is this table a function?  Explain.

• Yes, because none of the inputs repeat.
• Yes, because the inputs repeat but have the same output
• No because the inputs repeat
• No because the inputs repeat and have different outputs

Evaluate f(2).

Click on the picture to make it larger.

• f(2) = 5

• f(2) = 12

• f(2) = 10

• f(2) = 0.5

What does f(1990)=214 mean in the context of the problem?

• In 1990 there were 214 million people with health insurance

• In 214, there were 1990 people with health insurance

• When there are 1990 people, the year is 214

• None of these

For what value of x does f(x) = -2?

• x = 0

• x = -5

• x = 3

• x = -3

Find the value of f(x), given x = -1

• 0

• 1

• 2

• -1