Set up the equation 72=2(x-4)+2(x), the answer is x=20
To solve this for c, you need to use the Law of Sines which is SinA/a=SinB/b=SinC/c. So, your equation would be Sin39/15=Sin79/c. To solve this you would do the fish method. So first, you multiply sin79 x 15. Then you would divide the answer of that by sin(39) which = c
c= 23.4
Hope this helped :)
You should use photomath it is an app that can answer any equations and the answer will tell you where to mark it in the graph :) example: if the answer is 17.5 you would mark a dot between 17 and 18 !!
Answer is B. Have a nice day.