Answer: D) 32.8
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Work Shown:
We'll apply the tangent ratio
tan(angle) = opposite/adjacent
tan(64) = x/16
16*tan(64) = x
x = 16*tan(64)
x = 32.8048614652688
x = 32.8
Make sure your calculator is in degree mode. One way to check is to compute tan(45) and you should get 1 as a result.