exam Maths Puzzle Numerical Ability

Which two expressions are equivalent? Explain your reasoning.

-sqrt, sqrt-36, -6

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exam Other Question

Hi Can I have some help solving this piecewise function?

Evaluate the piecewise defined function at the indicated values.
f(x)={(-2x if x < -5, x + 4 if -5 <= x <= 2, (x - 2) y varies directly with n; m = 144 when n = 8.