Answer
a. $2x+14$
b. $2x+7$
c. $18$
d. $11$
Work Step by Step
Given $f(x)=2x$ and $g(x)=x+7$, we have:
a. $(f\circ g)(x)=2(x+7)=2x+14$
b. $(g\circ f)(x)=2x+7$
c. $(f\circ g)(2)=2(2)+14=18$
d. $(g\circ f)(2)=2(2)+7=11$