Which is a unit rate a)47c for 2 pens b)20 gallons or 2 hours c)15 hours for 3 months d)18 miles driven in a week

D) 18 miles driven in a week

Explanation:

A unit rate describes how many units of the first type of quantity corresponds to one unit of the second type of quantity.

a. 47 c for 2 pens

thus the price is for 2 pens and not 1.

b. 20 gallons or 2 hours

Thus the amount of gasoline used is for 2 hours and not 1.

c. 15 hours for 3 months

Thus the time given is for 3 months.

d. 18 miles driven in a week

The distance given is for 1 week and thus is the unit rate.

Thus unit rate is 18 miles driven in a week.

c. magnitude and direction

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