exam Maths Puzzle Numerical Ability

can you please help me solve this: (r^-6s^-2)/[(r^2s^6)^-1]
Thank you so much!!

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exam Other Question

((7/x-1)+(6/x+2))/((9/x+1)-(8-x-1)) Directions say: "solve each inequality. State the solution set in interval notation and sketch it's graph"

-3/5 < 1/5 - 2/15w< -1/3

I'm having trouble understanding where t