book Maths Puzzle Numerical Ability

the square of anumber exceeds 11 times the number by 312. find the number.

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I need help with this problem it says: Determine the symmetry with respect to x axis, y axis and origin if any exists. abs(y) = -x Thanks. Now I have the problem. I just want to check this one.

-6-(-7)-15-(-12)=?

We are coming up with -2. Is this correct?

Thanks,
Jeff