Question 1069324
a^2=b^2+c^2-2bc cos A
=64+25-2(40) *0.3746=89-29.97=59.03
sqrt(59.03)=7.68
Now use law sines
sin 68/7.68=sinC/5
sin C=.6034
Take arc sin both sides: C=37.11
I will choose D.