exam Maths Puzzle Numerical Ability

While on vacation,Allison noted that a $5.50 breakfast actually cost her $5.83 because of sales tax. what is the sales tax?

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Please help me. I am having problem with this question.

Anne is pulling on a 60-foot rope attached to the top of a 48-foot tree while Walter is cutting the tree at its base. How far from the base of the tree is Anne standing?

Thank you find an equation with coefficients whose roots are 2 plus and minus the square root of 3 divided by 3