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Question
Difficulty Level:

Easy

MCQ

An ice cream truck that plays loud music is circling Bulan’s neighborhood. C(t){C}({t}) models the volume of the music (in dB{dB} ) that Bulan hears, t{t} minutes after the truck arrives in her neighborhood. Here, tt is entered in radians.

C(t)=15cos(2π15t)+65C(t)=-15 \cos (\frac{2 \pi}{15} t)+65

How many minutes after the truck arrives does the volume first reach 75 dB75 {~dB} ?

Round your final answer to the nearest tenth of a minute.

Select all that apply :

5.55.5

7.87.8

4.54.5

6.96.9

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