What is the slope of the line that passes through the points ( 16, -1 ) and ( -4, 10 )?

a) -20/11

b) -11/20

c) 11/20

d) 20/11

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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.