Will mark the brainiest what other angle in a different quadrant has the opposite(i. e. negative value) of cosine theta as 60 degrees?

What can you determine about the solutions of this system

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a