exam Maths Puzzle Numerical Ability

Given x + iy form, write in polar form: 2 radical 2 (1-i)

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exam Other Question

A ball is thrown vertically upward from the ground with an initial speed of 80 ft/sec. Its height is given by h=80t-16t^2. How high does the ball go? When does the ball hit the ground? A coin bank contains nickles, dimes and quarters. There are four times as many dimes as quarters. The value of the coins is 2.30. How many dimes are in the bank.
Please show formulas in solving.
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