exam Maths Puzzle Numerical Ability

Hi I need help on this problem that the teacher gave us as a discussion problem. Appreciate it!

A stockbroker at Critical Securities reported that the mean rate of return on a

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exam Other Question

How do you prove the following theorem.
If both pairs of an opposite sides of a quadrilateral are congruent, then the Quadrilateral is a paralleogram. How do I translate:
"fourteen more than one-half of the sqaure of Z" into a variable expression.