exam Maths Puzzle Numerical Ability

Multiply, using the vertical method
(mē-5mn+3nē)(mē+4mn-2nē)

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exam Other Question

I am going to take a final exam and i need help to making a study guide that i can understand how to do the following so i won't forget. I need someone who has a couple of minutes How do I work this problems?
PROBLEM:1
-2[4-3(x+5)]>4(2-x)

PROBLEM:2
-2(x-2)=2[x-4(x-2)+x]