Evaluate the algebraic expression 6x-2 when x=5/6

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

Question and answers are in the attached picture. you so much in advance.

Subscriptions to a popular fashion magazine have gone down by a consistent percentage each year and can be modeled by the function y = 42,000(0.96)t. what does the value 42,000 represent in the function?