If "u" varies directly with "v," and u = 6
when v = -7, what is "u" when v = 4

9/12 is the answer because 3/4 times 3 each is 9/12

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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.