exam Maths Puzzle Numerical Ability

what is g(x)=-2x

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exam Other Question

Simplify: [(27^-2x)(25^x)^4(3^6x)^1/2]/ 9^x(625^(x-1))^-2 Hi,
I have tried to figure this out without any luck. I hope you can help.

Andrea has 9 coins with a total value of 48 cents. What coins does she have?

Thank you so much!