exam Maths Puzzle Numerical Ability

If f(h)=h+(2/h)+1, find all values of k so that f(k)=4

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exam Other Question

The function 4x+3/x is an anti derivative of g(x). Then g(1) is closest to?
The answer is 1. im not sure how they got this answer. Any help is appreciated. 5. Business and finance: Under a new contract, the salary for a position increase from $31,000 to $33,635. What rate of increase does this represent?