Answer:
-0.917144001
Step-by-step explanation:
I don’t know yet I’m solving it sorry
I think its C
7.7
a ^2+b^2=c^2−2bccosA
l^2 = 5.9^2+7.1^2-2(5.9)(7.1)cos 72
Answer: 12.04 feet
Hope this helped.