exam Maths Puzzle Numerical Ability

please!

if f(3/x)=2x-1/3

compute

f(x)=?

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exam Other Question

Assume the cost of a company picnic is described by the function P(n)=(1/2)n^2-10n+80 where n represents the number of employees and family members attending the picnic and P (in A company borrows $75,000 which is to be repaid with equal payments semiannually for 10 years. The interest rate is 10%. Find the semiannual payments.