exam Maths Puzzle Numerical Ability

f(x)= x^-2x+8x+4

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exam Other Question

Assume that all variables are positive and multiply:
y^3/6 (y^-3/6 + 7y^3/6) The sum of the ages of a married couple is 60. If three times the age of the husband is nine less than four times the age of the wife, how old are they now?