exam Maths Puzzle Numerical Ability

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

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exam Other Question

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.
1) What is the domain of f(x)= the square root of 3x+2
I wrote the words "square root" becaus I there is no symbol for it on the computer.

2) What is the domain of f(x)=