Ok, so I spent like 15min on this and I got no luck -_- some help on how to do this question, plz and ty

2. For each of the 3 vectors you are given r and $\theta$

First of all, convert them back to cartesian co-ordinates.

$x = r \cos \theta$

$y = r \sin \theta$

3. Here is what I did. (after taking another 15min lol)

I found out the x-coord's and y-coord's for each. Added them all up. Then I found the Rx and Ry, then I found the angle and magnitude.

My anwer for angle waws -8.6, and the magnitude was 20.1

4. You need to say the from where you are measuring the angle. If you measure it from the x direction, you'll need 180 - 8.6 = 171.4 and since it is anticlockwise, you say that it's -171.4 degrees from the x axis.