exam Maths Puzzle Numerical Ability

i need the answer to (2ab^-2)^-2/(5a^-3b-4)

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exam Other Question

-x-4>3x-2 Mrs. centeno invested half of her money at 7 percent and half at 8 percent per year, her annual income from the two investment was 7,500.00 how much did she invest at each rate?