exam Maths Puzzle Numerical Ability

if the sides of a square are decreased by 3 cm, the area is decreased by 81 cm^2. what were the dimensions of the original square?

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exam Other Question

find the surface area and volume of a sphere which has a diameter of 48 cm. can you help me solve {{{y=2/3x+1}}}? i know its in slope intercept form and i have to graph it but i dont know how. the x is supposed to be next to the 2/3...