How to Write a Vector in the Same Direction and Magnitude

How do you calculate the magnitude of a vector given its components?

What is the process to find a vector that has the same direction but a different magnitude?

Explain the significance of the unit circle in determining the unit vector.

What is a unit vector and how is it related to the magnitude of a vector?

If a unit vector has a magnitude of 1, how can you find a vector with a magnitude of 9?