exam Maths Puzzle Numerical Ability

Simplify: (27^(-2x))(25^x)^4(3^(6x))^1/2 / 9^x(625^(x-1)^-2

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exam Other Question

Which is the slope of Ax+By=C?

-B/A C/A -A/B C/B Ed has 100 dollars more than Robert. After Ed spends 20 dollars on groceries, Ed has 5 times as much as money as Robert. How much money does he have?