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help me with my math please!

got in this special program, and to thier oppinion i hsould have known a ton of stuff which i dont know.
so please, be helpful, i took the time writing these problems.
thanks!

(a^2a^3)a^(n+7)(b^4)^(n+3)
------------------------------------
[(a^2)^(n+1)b^(n+1)]^3 b^(n+8)

{x+(x-y)^2= y+56
{y+(x+y)^2= 6-x

5x(x-1)>_ x(7-4x)

X^2-7x
-1<----------<2
X^2-9

|x+4|>_|5-x|+7

>_ = bigger or equal to