exam Maths Puzzle Numerical Ability

Simplify:
a) (2b^x)^2/(4b^3x-1)^-1
b) (x^-2 + y^-1)^-2
c) x^-2 - y^-2/ x^-1 - y^-1

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exam Other Question

Please, help me!
I do not understand how to graph a equation. Please help.

1.) Graph the solution set of the following inequalites.

X 74?

2.) 3X . 2X - 4?

3.) graph y=4