book Maths Puzzle Numerical Ability

(-3xy^-9)^-2/(xy^-7)^-2

Simplify the expression using positive exponents only.

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book Other Question

The measure of an interior angle of a regular polygon is three times the measure of an exterior angle of the same polygon. What is the name of the polygon? The difference of two numbers is 34. The second is 4 less than 3 times the first. What are the two numbers? The sum of two numbers is 92. The second is 4 more that 3 times the first what are the two numbers?