Not sure if I should put in ALG or trig section because I am in ALG2/Trig. I figured that since I haven't been working with sin and cos yet, it would belong here.

I have been having trouble. I wasn't sure how to write this, so I took a picture. For number 7a,b,c I do not know what to do. If someone could guide me in the right direction that would be very helpful. Thanks!