On the interval $0,8$ the continuous function $f$ has graph

$$

Determine the value of the integral

$I={\displaystyle \underset{0}{\overset{8}{}}}f(x)dx$

$I=\frac{55}{2}$

$I=\frac{59}{2}$

$I=\frac{57}{2}$

$I=\frac{53}{2}$

$5.I=\frac{61}{2}$