Help please math is exciting?

Question

factor.

1.) t^2 - 2t - 63

2.) Express usin a positive expnent

h-8

3.) (7 - 9x^4)^2

4.) simplify. Assume y, z = with a / through the =sign

(yz^3)-4

Answer 1

I was actually going to help until I read Laura's answer.  Give up or get a tutor.