exam Maths Puzzle Numerical Ability

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?

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exam Other Question

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 I am very confussed on a problem, I barel even know where to start.
A/BH = 1/2 I am solving for H. I am very confussed, I know the LCD must be 2BH. I am just wondering how I am going about this.