book Maths Puzzle Numerical Ability

-10+(+3) the answers are... -12,12,-6,or 6(thank you) P.S. is this algebra? or pre-algebra?

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looking desperately for the answer to this:

6x to the second power - 12x - 18 = ????

Please help... thank you, krista m pooler Is there any number that is not a real number?