exam Maths Puzzle Numerical Ability

I didnt understand this.. could you help me out?

A right triangle has a leg of length x and a hypotenuse of 2x. Write an equation to find the lengt s of the other leg and use i

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Please help w/ the following:

2x^-2+3x^-1+1=0

Thank you. Tony works part-time at a restaurant as a busboy. He is paid an hourly wage of $5.65 for 20 hours per week. If he takes a job as a waiter, he will loss his hourlywage but will make