Which equation represents a linear function? O A. y = 2x + 7
O B. y = x2 + 4
O C. y = x(x + 1)
OD. y = 2x3

It’s A because that’s the only place x makes sense

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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.