book Maths Puzzle Numerical Ability

Simplify: -12^-2

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book Other Question

A director of a zoo wants to use 170 meters of fencing to enclose a petting area of 1750 meters squared. Find the dimensions of the petting area. Yikes nobody I know knows this stuff. Please Help
Thanks bunches.

2/3y + 4 = 2x

secondly


1/2(y + 5) + 4x = 3x