exam Maths Puzzle Numerical Ability

Can someone please help me with this one.

Evaluate. 3^-5

A) -15
B) -243
C) 1/243
D) -1/243

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exam Other Question

Assume that y varies inversely as x. If y = 4 when x = 1/2, find y when x = 2 The rectangle of maximum area that could be inscribed inside a right angle triangle has dimensions equal to half the lengths of the sides adjacent to the rectangle. Prove that this