The absolute value of a number is its distance from 0. An easy way to think about this is that the absolute value turns a negative number positive, and has no effect on positive numbers. In this case, we are taking the absolute value of a negative number. This means we should simply make the number positive. Therefore, the answer is
Rectangular prism the two square on the end have 4 vertices each
Divide 7 by 8 then multiply what you get by 100.