book Maths Puzzle Numerical Ability

What is the area of s trapezoid with vertices(-3,-1), (3,3), (-1,3) and (3,-1)?
a.24 square units
b.20 square units
c16 square units
d.12 square units

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book Other Question

In this problem it says to simplify. Can I see a step by step on how to do that?

5x to 12th y square/10xy9 Confused about problem. Need to solve this but I do not know how to use the formula. Need to know the sum of pairwise comparisons.

1+2+3+...+498+499+500