exam Maths Puzzle Numerical Ability

Give answer in a + bi form.

4 - 5i / 2 + 3i

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exam Other Question

Hi, Can you help me with this math problem?

If f is one-to-one find and equation for its universe.
f(x)=x^3-5 I am stuck on correct answer for:

(3 x 10^2) x (2 x 10^-3) = =

I am not using any specific book. I am just practicing...