exam Maths Puzzle Numerical Ability

how do you solve and graph inequality # 24
-x-2y>4

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exam Other Question

please help explain how to do this problem:

The length of a rectangular wall is x units and its height is (x - 3) units. Find an expression for the perimeter of the wall. page 283 #86
What expression raised to the fourth power is 81x^12y^8z^16 ?

and

page 294 #54
Simplify and write the answer with positive exponets ONLY.
(x^2