Select the equation represented in the graph. D. Y = -x^2
C. Y = (x)
B. Y= -(x)
A. Y = x^2

If cheese is $4.40 per kilogram, you should pay .88

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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.