Answer:
21.28
Explanation:
Hey There!
So the law of sines says

To solve for c we just plug in the values that are given to us

step 1 multiply each side by sin31.6
now we have

assuming that you have to round
if you're supposed to round to the nearest whole number then the answer is 21
if you're supposed to round to the nearest tenth then the answer is 21.3
if you're supposed to round to the nearest hundredth then the answer is 21.28