Anne drove 168 miles in 3 1/2 hours. She then drove the next 2 1/4 hours at a rate of 5 miles and hour faster that the first rate. How many miles did Anne drive during the 5 3/4 hours?

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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.