Answer:
8
Explanation:
The derivative of a composition function is called the chain rule.
The chain rule states that if we have some function, h, that is composed of f and g such that
h(x)=f(g(x)), then h'(x)=f'(g(x))g'(x)
So h'(4)=f'(g(4))g'(4)= f'(1))g'(4)= (4)(2)=8