book Maths Puzzle Numerical Ability

Is there any number that is not a real number?

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book Other Question

-10+(+3) the answers are... -12,12,-6,or 6(thank you) P.S. is this algebra? or pre-algebra? Find the dimensions of the square picture that make the area of the picture equal to 75%of the total area enclosed by the frame. the toatl are of the frame is 144in please can u help me