Book Maths Puzzle Permutation and Combination

The perimeter of a square is to be between 17 and 56 feet. Find all

possible values for the length of its sides.

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Book Other Question

A student has grades on three examinations of 76, 80, and 72. What must the student earn on a fourth examination in order to have an average of at least 80? if Z is a complex number and |Z - 4/Z | = 2 what is the value of |Z | ?