Need help on these, need explanation too please.
1.Which of the following is equavlant to (2z^3)/(8z^(n-2))
a. 1/4z^1-n
b. z^5-n
c. 1/4z^(5-n)
2.Find the range of negative squareroot (36-x^2)
so far I gotten (x+6)=-6 and (x-3)=6 so would it be y:y -6<y<6?
3. Find all solutions for sin^2=3cos^2
4. Suppose -2x+y=4 and 3x-5y=-6 whats y/x=