2
QuizMultiple Choice

Use Exponential Functions

Question 2 • 25-26 CRX Math Models with Applications 7052A

A guest on a talk show tends to receive many phone calls right after she is on the show, and then the calls become less frequent. This can be represented by the equation y = 30(0.92)d, where y is the number of phone calls after d days. How many phone calls should she expect after a week?

Answer
A
28
B
23
C
17
D
2

Explanation

A week is 7 days, so substitute d = 7 into the decay equation: y = 30(0.92)^7 ≈ 16.8. Rounding to the nearest whole phone call gives 17, so she should expect about 17 calls.

AI-written and checked against the verified answer.

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