book Maths Puzzle Numerical Ability

please, help me find the |Z|, where Z=5/x-yi

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book Other Question

Solve equation by completing hte square; completely simplify your answer; express any complex numbers usng i notation: 4x^2-9x=9 Kyle weighs twice as much as his younger sister Suzanne and 10 pounds less than his older sister Margaret. All together they weigh 90 pounds. How much does Margaret Weigh.