Book Maths Puzzle Algebra

if Z is a complex number and |Z - 4/Z | = 2 what is the value of |Z | ?

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Book Other Question

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

possible values for the length of its sides. Mary is twice as old as Ann was when Mary was as old as Ann now is. Ann is 57. Mary is how old?