Find one positive and one negative coterminal angle for 8pi/15

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists