1.$\displaystyle \int_1^2 \frac{x-4}{x^2} dx$ *ANSWERED*

2.$\displaystyle log_a(2^a) = \frac{a}{4}$, then $\displaystyle a =$ * ANSWERED*

3.Inverse of $\displaystyle y=2x^3+3x^2+7x+4$ *ANSWERED*

(i know how to do inverse, but this polynomial is throwing me off...)