exam Maths Puzzle Numerical Ability

I need your help to
Simplify. Write the answers with all exponet negative

(5x^-3y^-2)^2(x^0y^-1)^-4

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exam Other Question

The management of Fast Airlines tracks the proportion of the company’s passengers that are flying on business trips. An on-board preliminary study conducted last year revealed tha Determine if this is rational or irrational:

- ^4sqrt16

Is this rational or irrational? I believe it is irrational because there is a negative sign before the 4 sqrt 16
Am I correct? Thank you for your answer!