Let $\>f(x) = \sqrt{x+9}$.

a) Find $\>f(x+h)$:

b) Find $\>f(x+h)-f(x)$:

c) Find $\> \frac {f(x+h)-f(x)} {h}$:

d) Find $\> f'(x)$:

Your overall score for this problem is