Let $f$ be the continuous function defined on $-6,6$ whose graph consists of a quarter circle and three line segments, as shown above.

Let $g$ be the function given by $g(x)={\displaystyle \underset{-1}{\overset{x}{}}}f(t)dt.$

A$)$ Find $g(-6)$

B$)$ At what value$($s$)$ of $x$ on $g(x)-2x1,$:$.xgx=4y-(-\frac{9}{4})=-(x-4)g-6,6-6is$ the graph $ofg(x)$ increasing? Justify your answer.

$C$