exam Maths Puzzle Numerical Ability

Simplify the expression. With the result using only positive exponents.

x^5(x^-8)^-6/(x^-7)^-2

a)x^18 b)x^57 c)x^39 d)1/x^57

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exam Other Question

A rectangular plot has benn fenced with 300m long wire. Find the lenght and width of the plot if the length is twice its width? Two isoceles triangles have the same base length. The legs of one of the triangles are twice as long as the legs of the other. Find the lengths of the sides of the triangles if their perimeters are 23cm and 41cm.