I need help ! (sinusoidal models word problems) – Khan Academy Help Center

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4137smj

May 10, 2019 18:17

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I am not a native, my english is poor sorry.

this is problem in sinusoidal models word problems practice.

C(t) = -15cos(2pi/15*t)+65

t = 15/2pi(2.3005 + 2pi*n)

t is about 5.5 + 15n

Why 15/2pi * 2.3005 is 5.5 here?

I did this on calculater the answer is 54.20425...

It's not clearon text so I add screenshot.

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4137smj

May 15, 2019 16:06
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problem is solved..

I put 15/2pi * 2.3005 on calculator the answer is 54.2042542469.

but I put 15/(2pi) * 2.3005 the answer is 5.49203919874 It's a correct answer.

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