Derivative of FUNCTION

If $f(5)=1$, $f'(5)=6$, $g(5)=-3$ and $g'(5)=2$ determine:

a) $(f\times g)'(5)$

b.)$\left(\frac{g}{f-g}\right)'(5)$

Answers can be viewed only if
1. The questioner was satisfied and accepted the answer, or
2. The answer was disputed, but the judge evaluated it as 100% correct.