Hey, this assignment is due tomorrow and we never focused on inequalities before, so I need a hand with these couple problems. Also, I don't really quite know how to use most of the symbols, so please bear with me.

These have to be solved and the answer stated in interval notation.

a. 45x^4 - 20x^2 greater than 0

b. -2/(x+5) greater than 0

c. (x^2 + 8x + 15)/(x^2 - 1) greater than or equal to 0

d. X^3 - 63 less than or equal to 1

I know a little bit about key numbers, number lines, etc. The main purpose for this is to confirm the answers i have already, especially since she doesn't give partial credit!