Unit 4 Lesson 5 Practice Problems

Write a sentence describing the meaning of the statement C(2)=40.

• It cost $2 to use 40 gigabytes of data using plan C.

• It costs $40 to use 2 gigabytes of data using plan C.

Which is less, C(4) or D(4)? What does this mean for the two phone plans?

• C(4) is less. The phone plan from Company C is less expensive if 4 gigabytes of data are used.

• D(4) is less. The phone plan from Company D is less expensive if 4 gigabytes of data are used.

Which is less C(5) or D(5)

• C(5)

• D(5)

Find g when C(g)=130

• 6 gigs

• 7 gigs

• 8 gig

• 9 gigs

For what input value or values is g(x)=4?

• 2

• -2 and 2

• 16

• none

Function P gives the perimeter of an equilateral triangle of side length s . It is represented by the equation P(s)=3s.

What does P(s)=60 mean?

• The perimeter of an equilateral triangle of side length s is 60.

• The perimeter of an equilateral triangle of side length 60 is s.

Function P gives the perimeter of an equilateral triangle of side length s . It is represented by the equation P(s)=3s.

Find s when P(s)=60 ?

• 10

• 20

• 30

• 40

Function G takes a student’s first name for its input and gives the number of letters in the first name for its output.

Describe the meaning of G(Jada)=4.

• The name Four has four letters in it

• The name Jada has four letters in it.

• The name Jada has Jada letters in it.

• The name Four has Jada letters in it.

Function G takes a student’s first name for its input and gives the number of letters in the first name for its output.

Find the value of G(Diego)?

• 7

• 6

• 5

• 4

W gives the weight of a puppy, in pounds, as a function of its age,t , in months.

Describe the meaning of W(2)=5

• When the puppy is 5 months old it weights 2 pounds

• When the puppy is 2 months old it weighs 5 pounds.