How warm is it?

At sometime during your life time you have undoubtedly found yourself outside on the warm evening, listening to crickets. Have you noticed that they chirp faster on warmer nights?  In fact if a cricket is chirping at the rate of r times per minute, the Fahrenheit is closely approximated by F(r)=0.25r+40.

1. Find and interpret F(150)
2. If the Celsius temperature corresponding to the Fahrenheit temperature is given by C(F)=5/9(F-32), find and interpret the composition of the function C and F.
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