WeBWorK Standalone Renderer

If $f(5)=-5$ , $g(5)=1$ , $f'(5)=2$ , and $g'(5)= 8$ , find the values of the following:
(a) $(fg)'(5)=$
(b) $(f/g)'(5)=$
(c) $(g/f)'(5)=$

You can earn partial credit on this problem.