exam Maths Puzzle Numerical Ability

These word problems are killing me today. The value:v(in dollars per acre) of a wheat crop (d) days after planting is given by v=6d-.05d^2 for 20<d<80. Find the maximum value for

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Simplify: [(27^-2x)(25^x)^4(3^6x)^1/2]/ 9^x(625^(x-1))^-2 1.)a man invested part of P150,000 at 12 percent and the remainder at 8 percent. if his annual income from the two investments is P14,560,how much does he have invested at each rat