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- anonymous

The temperature of a chemical reaction ranges between 20°C and 160°C. The temperature is at its lowest point when t = 0, and the reaction completes one cycle over an eight-hour period. What is a cosine function that would model this reaction?

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- anonymous

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- anonymous

A. f(t) = -90 cos pi over 4t + 70
B. f(t) = -70 cos pi over 4t + 90
C. f(t) = 70 cos 8t + 90
D. f(t) = 90 cos 8t + 70

- anonymous

I'm thinking it's C because I believe that the constant is 70?

- anonymous

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- anonymous

- anonymous

Okay it wasn't C

- anonymous

sorry @twinkle12377 Im not very good as trig I am better with algebra

- anonymous

I can usually help with calculus as well

- anonymous

personally I would graph the functions and choose the one the is 20 at 0 and 160 at 8

- anonymous

ohhh okay thank you so much! :) @zoomiemoo

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