exam Maths Puzzle Numerical Ability

Alright well the directions say "For the given value of a, find -a and the absolute of a" and the first problem is a=6 what would i do to find -a and the absolute of a?

Please&thanks.

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exam Other Question

Find the volume, to the nearest tenth, of a pyramid that is 6 feet tall and whose base is an equilateral triangle with sides each 10 feet long???? how would i do this? Simplify the following fractions by putting them in lowest terms or by performing the indicated operations.

a-ab over a2 divided by a-1 over a cubed