QuestionGiven $f(x)=7 x$ and $g(x)=7 x^{2}+9$, find the following expressions. (a) $(f \circ g)(4)$ (b) $(g \circ f)(2)$ (c) $(f \circ f)(1)$ (d) $(g \circ g)(0)$ (a) $(f \circ g)(4)=$ $\square$ (Simplify your answer.)