# Clueless in calculus

posted by
**Aparna**
.

The function f is defined by f(x)= (25-x^2)^(1/2) for -5 less than or = x less than or = 5

A) find f'(x)

B) write an equation for the tangent to the graph of f at x=3

C) let g be the function defined by g(x)= (f(x) for -5<or=x<or=-3)and (x+7 for -3<or=x<or=5)

D) find the value of the intagral 5 over 0 of x(25-x^2)^(1/2)dx