you have 3 times as many pencils as your friend , if you have 21 pencils how many does your friend have ?
2 answers:
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Since you have the 42-deg angle and the length of the opposite side, 31, you can use the Law of Sines.
We will use the law of sines first to find x.
Once we know x, we can find the angle opposite y.
Then we can find y.
Let z = the angle opposite y.
z + 42 + 53 = 180
z = 85