Answer:
45%
Step-by-step explanation:
Subtract 6 from both sides, you get 1/3x=-14
Now multiply both sides by there, hence x=-42
c^2 = a^2 + b^2 - 2(ab)(cos C)
c^2 + 2(ab)(cos C) = a^2 + b^2
2(ab)(cos C) = a^2 + b^2 - c^2
cos C = (a^2 + b^2 - c^2) / 2ab - Answer choice E
Hope this helps! :)