exam Maths Puzzle Numerical Ability

How do you simplify a^6b^-5/a^-2b^7?

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exam Other Question

Simplify:

sqrt(x^2+18*x+81)

Thanks again:)
Word problems are not my thing. Please help with steps.

One number is 10 more than a second number. The sum of the two numbers is 16. What are the two numbers?