Evaluate the following integral over the Region R. 

(Answer accurate to 2 decimal places).

 $\displaystyle \int$ $\displaystyle \int_{{R}}$ $\displaystyle {6}{\left({x}+{y}\right)}$ dA

$\displaystyle {R}={\left\lbrace{\left({x},{y}\right)}{\mid}{25}\le{x}^{{2}}+{y}^{{2}}\le{81},{0}\le{x}\right\rbrace}$

Hint: The integral and Region is defined in rectangular coordinates.