Adding and subrtracting fractions. solve each problem. write your answer as a mixed number(if possible)

5) 4 2/7 - 2 1/5
6)5 7/8 + 11/4
7)5/8 - 2/5
8)16/5 + 2 1/2

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.