Answer:
b = 9.2
Step-by-step explanation:
We can use the law of sines
sin A sin B sin C
-------------- = ------------= ----------------
a b c
We only need the first two parts
AC = b
Sin 31 sin 108
--------- = ----------------
5 b
Using cross products
b sin 31 = 5 sin 108
Divide each side by sin 31
b = 5 sin 108 / sin 31
b = 9.232875807
To the nearest tenth
b = 9.2
