book Maths Puzzle Numerical Ability

-a^2+9a-2a^2-9-10a

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I have a problem that I am having a difficult time solving.

If you are h feet above the earth's surface, the distance, d, that you can see is approximately d (in miles) = the sq Solve the system of inequlities by graphing. X+Y< 2 X+2Y > 1