Yo, I'm trying to do my homework on the Law of Sines and I'm looking at the example to figure it out but I don't get how to simplify this step (circled in picture). When I type that into a calculator, I get -13.4.

Answer:
Are you asking how the answer became 16.1?
Step-by-step explanation:
Well the squiggly lines indicate that its an approximation so use a scientific calculator if you have one or use an online scientific calculator and plug in 12sin89/sin48. Your answer should be 16.145 rounded to 16.1