B Vector addition- Positive x axis.

[opus]

Please see the attached page to see what I'm talking about.
In the top right paragraph, it states to use "the positive direction of the x-axis".
It is given that $θ_2=30°$ and it shown visually at the bottom of the page.
In the problem it's using -60° and I'm not sure how they're getting that.

 

[opus]

Given pictures

 

[jtbell]

Here's the second vector by itself. Counterclockwise from the +x axis is a positive angle; clockwise from the +x axis is negative.

 

[opus]

Exactly what I was looking for. Thank you @jtbell.