Question

Am I right?
The temperature of a chemical reaction ranges between 30 degrees Celsius and 70 degrees Celsius. The temperature is at its lowest point when t = 0, and the reaction completes 1 cycle during a 10-hour period. What is a cosine function that models this reaction?

f(t) = 20 cos (10t) + 50
f(t) = 50 cos (10t) + 20
f(t) = −50 cos (pi over 5t) + 20
f(t) = −20 cos (pi over 5t) + 50 <---- Answer

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