The population of Ellisville was already less than 250 before Bob and Ann Tyler and their three children moved away. Write and solve an inequality for the population of Ellisville after the Tyler family left.

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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.