book Maths Puzzle Numerical Ability

|x|=10

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book Other Question

If a number is subtracted from its square, the result is 2. Find the number.

The length of a rectangle is 4 cm longer than the width. If the perimeter of the rectangle is 20 cm what is the area? Area=___cm^2
thanx
what is the formulas for finding out the areas for cylinders and hexagons and all the abnormal shapes? please hurry on getting back to me it is finals week and I am not doing well. thank you.