Posted by
**Elizabeth** on
.

In a certain city the temperature (in degrees Fahrenheit) t hours after 9 a.m. was approximated by the function

T(t) = 50 + 14sin((pi*t)/12).

Find the average temperature (in degrees Fahrenheit) during the period from 9 a.m. to 9 p.m.

I got (1/12)((12/pi)(50(12)-14cos((pi)))+(12/pi)(50(0)-14cos((0)/12))) but it's wrong...

Use wolframalpha website, it helps!

Thank you for your time!