exam Maths Puzzle Numerical Ability

Hi! For this question it asks to simplify, the problem is: a^-3 b^2.
What I got for this was ab^1. Please help me Thank You=)

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exam Other Question
A bicyclist rode into the country for 5 hr. In returning, her speed was 5mi/hr faster and the trip took 4 hr. What was her speed each way? add express in simplest form

x^2
over
x+10

plus
9x-10
over
x+10