Exponential & Linear Functions (Interpret and Create Equations)5

The number of mosquitoes at the beginning of the summer was 4,000. The population of mosquitoes is expected to grow at a rate of 25% a month. How many mosquitoes will there be after 4 months?

• 9766

• 9765

• 9006

• 5433

The value of a car is $15,000 and depreciates at a rate of 8% per year. What is the decay factor?

• .08

• 8

• .92

• 1.08

Write an equation that models the following situation:

Julie's hair was known to grow very rapidly. It began at a length of 4 in and grew at a rate of 12% a week.

• y=6(.12)^x

• y=4(1.12)^x

• y=6(1.14)^x

• y=4(.88)^x

The Straight Talk Cell Phone Company charges $15.00 per month plus $0.20 per minute of airtime usage. If Juanita uses x minutes of airtime, what is an equation that can be used to determine her monthly cell phone bill (C)?

• C =15 (0.20x)

• C = 15 + x + 0.20

• C =15 (0.20x)

• C = 0.20x + 15

A man is climbing down from 100 feet high descending 30 feet per minute. Which equation represents this.

• y = 100x - 30

• y = 100 - 30x

• y = 100x + 30

• y = 100 + 30x