exam Maths Puzzle Numerical Ability

Simplify. i^-34

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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? Suppose the length of a side of a square is n units and the length of an edge of a cube is n units.
a. If all the side lengths of a square are doubled, are the perimeter and the