exam Maths Puzzle Numerical Ability

May I have some help evaluating this expression?

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

sqrt(1/5) sqrt(-125

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exam Other Question

6+y/14y+8y^2+y^3+12 i am 900 more than the greatest possible 4-digit even number that can be made using the digits 1, 4, 2, 5. What number am I?