Martina made $221 for 13 hours of work.
at the same rate, how much would she make for 9 hours of work?

221/13=17
17*9
=153

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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.