NAME DATE PERIOD Lesson 5 Skills Practice

NAME _____________________________________________ DATE __________________ PERIOD _________

Lesson 5 Skills Practice

Compare Properties of Functions

1. Cassie is downloading music and games onto her phone. It costs $0.99 to download a song to her phone. The costs of downloading games are shown in the graph. Compare the functions for each kind of download by comparing the costs.

Cost ($)

Cost of Downloading Games

10

9

8

7

6

5

(2, 3.18

4

3

2

1

(1, 1.59

0

12345

Number of Games

The rate of change for songs

is 0.99. The rate of change for

games is 1.59. 0.99 < 1.59.

2. The number of gallons y a pool drains in x minutes is represented by the function y = 20x. The table shows the time it takes to fill up a pool. Compare the functions for each process by comparing the times.

Number of Minutes

Number of Gallons

1

15

2

30

3

45

The rate of change for draining is 20. The rate of change for filling is 15. 20 > 15.

3. The speeds of a coyote and giraffe are shown in the graph and table below.

a. Compare the functions by comparing the rates of change.

The rate of change for a coyote is 43. The rate of change for a giraffe is 32. 43 > 32.

Distance Ran (mi)

b. How much farther does a coyote run than a giraffe after 3 hours? 33 miles

Land Speed of a Coyote

50

45

40

35

(1, 43)

30

25

20

15

10 5 (0, 0)

Land Speed of a Giraffe

Number of Hours

Distance Ran (mi)

0.5

16

1

32

1.5

48

0

1 23

Number of Hours

Copyright ? The McGraw-Hill Companies, Inc. Permission is granted to reproduce for classroom use.

64

Course 3 ? Chapter 4 Functions

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