book Maths Puzzle Numerical Ability

Simplify the expression

(-3a^-3 b^7 / 2a^4 b^2)^3

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book Other Question

In an isosceles triangle, the length of the third side is 25% of the length of one of the equal sides. Find the length of each side when the perimeter is 135 feet. What is the interior degrees of a 20-gon?