Graphic representations of complex numbers

Question

Hello can someone help I've been doing some exercises about complex numbers. But I am not really good at reading their graphic representations. Can you guys tell me if I did the exercise right, please?

The exercise: Let us consider the complex numbers z and w drawn in the Argand plane. What is the complex number u represented?

1. I choose -2z
2. I choose the conjugate of z
3. I choose z + w
4. I choose 1/w
5. I choose zw

Answer 1

They are all correct. Pro-tip, when you multiply two complex numbers, you're adding their "angles" (with respect to the positive x-axis), so it makes sense that $zw$ is "between" $z$ and $w$.