Translate the following phrase to a mathematical expression. a number times fifteen

15 n
15 + n
15 ÷ n
n15

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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.

The answer is 30 minutes to an hour