Function Notation and Functions

Which set of ordered pairs is a function?

• <(9,5), (10,5), (9,-5), (10,-5)>

• <(3,4), (4,-3), (7,4), (3, 8)>

• <(6,-5), (7, -3), (8, -1), (9, 1)>

• <(2, -2), (5, 9), (5, -7), (1, 4)>

Which of the following statements is true regarding the mathematical statement f(12) = -5? Select all that apply.

• The function f maps the x value of 12 to the y value of -5.

• The function f maps the x value of -5 to the y value of 12.

• The function passes through the point (12, -5).

• The function passes through the point (-5, 12).

• None of the above.

If f(x) = 2x + 1, what would be your first step to find f(1)?

• Plug a 1 in for all the x's

• Set the function equal to 1

• Only plug a 1 into the left side

• Use Desmos

• I don't know

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

• 6

• 7

• 8

• 9

What is the value of f(0)?

• -2

• 2

• 4

• 0

• -5

Evaluate for f(1)

• 0

• -3

• 3

• 2

• 4

Given that f(x)= 2x² + 5x - 17, find f(-1).

• f(-1) = -20

• f(-1) = -24

• f(-1) = -10

• f(-1) = 0

• f(-1) = 6

The function c(m) = 1.45m + 3.50 represents the cost of a taxi for m miles.
What does c(7) represent?

• cost of $7 to ride the taxi

• cost to ride 7 miles

• minimum distance to ride a taxi

• minimum cost of a taxi

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

Ms. Brackemyer is collecting pencils.  The function p(x)=5x+12 tells us the total amount of pencils Ms. Brackemyer has after collecting for x number of days.  What is the meaning of p(8)=52?

• Ms. Brackemyer starts with 8 pencils and ends with 52.

• After 8 days, Ms. Brackemyer has 52 pencils.

• Ms. Brackemyer starts with 52 pencils and gets 4 more every day.

• Every day, Ms. Brackemyer gets 4 new pencils until she has 52.