exam Maths Puzzle Numerical Ability

When simplifying a radical, is it necessary to take the absolute value of a result to indicate the principal root?

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exam Other Question

how do u solve this? -7=2/3x+5 The sum of the lengths of one side of a right triangle and the hypotenuse
is 20 cm. The other leg is 5 cm shorter than the hypotenuse. Find the
length of each side.