Hi Diesel, it is preferred you post your attempts at each problem here at MHF.
I am prepared to give you a hand by showing you a similar problem
Consider the following integral $\displaystyle \int_{-1}^3(2x+5)~dx$
Applying the rule $\displaystyle \int x^n~dx = \frac{x^{n+1}}{n+1}+C$
We obtain $\displaystyle \int_{-1}^3(2x+5)~dx = \left[x^2+5x\right]_{-1}^3$
Now to find the definite integral's value we say $\displaystyle \left[3^2+5\times 3\right]-\left[{(-1)}^2+5\times (-1)\right]=\dots$
I'll let you take care of the arithmetic.
And here's a hint for the second question
$\displaystyle \frac{3}{x^4} = 3x^{-4}$