Just a few setup problems... If I knew what strategy to use to evaluate these integrals, I'd be better off. That's all I need to know for the following:

1.) Find the volume of the solid formed by revolving the region bounded by the graphs of $\displaystyle y = -x^2 + 4$ and y = 0 about the x-axis.

2.) Evaluate:

$\displaystyle \int_{-4}^4 \sqrt{16 - x^2}dx$

3.) Evaluate:

$\displaystyle \int \ln{2x} \ dx$