Chapter 4.2, Problem 34E

The graph of g consists of two straight lines and a semicircle. Use it to evaluate each integral.

(a) ${\displaystyle {\int }_0^{2}g\left(x\right)dx}$    (b)     ${\displaystyle {\int }_2^{6}g\left(x\right)dx}$    (c)     ${\displaystyle {\int }_0^{7}g\left(x\right)dx}$