book Maths Puzzle Numerical Ability

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

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book Other Question

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 Casey has 10/8 pan of brownies. He is going to give each child a portion of size 3/4 of a full pan. How many children can he serve? What part of the portion is left over?