Evaluate.

$($a$){\displaystyle \underset{-2}{\overset{2}{}}}(3x^8-2)dx$

$($b$){\displaystyle \underset{-\frac{}{4}}{\overset{\frac{}{4}}{}}}(x^3+x^{4}tanx)dx$

$($c$){\displaystyle \underset{\frac{}{3}}{\overset{\frac{}{3}}{}}}{x}^{4}sinxdx$

An oil storage tank ruptures at time $t=0$ and oil leaks from the tank at a rate of $r(t)=100e^{-0\mathrm{.}01t}$ liters per minute. How much oil leaks out during the first hour?

The rate of growth of a fish population was modeled by the equation

$G(t)=\frac{60,000e^{-0\mathrm{.}6t}}{(1+5e^{-0\mathrm{.}6t}{)}^2}$

where $t$ is the number of years since $2000$ and $G$ is measured in kilograms per year. If the biomass was $25,000kg$ in the year $2000,$ what is the predicted biomass for the year $2020?$