California Baptist University Law of Sines and Cosines Problems

I’m working on a mathematics discussion question and need an explanation to help me study.

Law of Sines and Cosines Problem

Solve for ? in the oblique triangle ABC; AB = 30; AC = 15 and angle B = 20°

Oblique triangle ABC; AB = 30; AC = 15 and angle B = 20°

Type out the two equations substituting the numbers from the diagram.
Type out the Law of Sines set of relationships and type out the most appropriate version to use the Law of Cosines for this solution.
Solve for a using both methods (show step by step work)

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