exam Maths Puzzle Numerical Ability

May I have some help finishing this expression?

Evaluate the expression and write the result in the form a + bi.

i^402

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exam Other Question

set up and solve: a stock broker bought stocks and laater sold them for $5136. If this broker made a 7% profit, how much did the stocks originaly cost? Evaluate: (x^-2-y^-1)^-2