exam Maths Puzzle Numerical Ability

Graph the inequality

20). x + y ≤ 5

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exam Other Question

Need explanation of how to find the answer for the cubed root of 2/5. The question in my homework is:
Write the answer using positive exponents only
[2x5y^-4/3y^-2]^2

I know I need to flip to make them positive but have been wracking my brain trying to figure out where to go from there