exam Maths Puzzle Numerical Ability

x^2-9/x+2*x^2-4/x-3

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exam Other Question

a(1-e^2)/(1-e^2sin^2A)exponent of 3/2 = a/sq root of 1-e^2sin^2A WHAT IS THE PAYBACK PERIOD FOR A $20,000 PROJECT THATS EXPECTED TO RETURN $6,000 PER YEAR FOR THE FIRST TWO YEARS AND $3,OOO PER YEAR FOR YEARS THREE THROUGH 5?
A. 3 1/2
B. 4 1/2