exam Maths Puzzle Numerical Ability

is the suare root of x^2 = x an identity (true for all values of x) explain?

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exam Other Question

Mr. Agustin bought a color TV set worth P8,680, a washing machine for P6,850 and an electric fan for P1,060. If he was given an 8% discount, how much did he pay? v=1/3 3.14 times r times r times h (solve for 3.14, r, h,)