Need Help getting started on the following problems, it's been almost 10 years since I have had any algebra, but it was always my favorite subject, so if I know I'm doing it correctly, I will catch back on.

1) solve for a: a^2 + 4a=45

2) Let f(x)= x^2+2x-2 and g(x)= 2-3x. Find the following:

a) f(-1)

b) g(-3)

c) f(a+b)

3)solve for x: (2/x-1) +1=(2/x^2-x)

4) sove this system of equations:

5x+4y=-8

2x-y=-11

If anyone can help, it would be greatly appreciated!

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