exam Maths Puzzle Numerical Ability

please!

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

compute

f(x)=?

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exam Other Question

what is the inequality of 9m+8>0 You need to purchase a textbook for nursing school. The book cost $80.00, and the sales tax where you are purchasing the book is 8.25%. You have $100. How much change will you receive back?