exam Maths Puzzle Numerical Ability

Who came up with how to find the distance between two points in a coordinate plane?

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Theresa sold three different magazine subscribtions for $28,$18,and $27. She sold three fewer of the $28 subscriptions than of the $18 subscriptions and a total of 34 subscriptions. If her total sales wer $819, how many $27 subscriptions did Theresa sell? if i represents the imaginary number whose square is -1,then (radical2 + radical2 x i)^4= ?