Joe rides his bicycle an average of 21 mph. The distance Joe rides d(t) (in mi) is given by d(t)=21t, where t is the time in hours that he rides. (a) Evaluate d(3) and interpret the meaning (b) Determine the distance Joe travels in 46min. Give the exact answer. Do not round.

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Joe rides his bicycle an average of 21 mph. The distance Joe rides d(t) (in mi) is given by d(t)=21t, where t is the time in hours that he rides. (a) Evaluate d(3) and interpret the meaning (b) Determine the distance Joe travels in 46min. Give the exact answer. Do not round.

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