Jim's new car has 150 miles on the odometer. He takes a trip and drives an average of m miles each day for three weeks. Which expression represents the mileage on Kim's car after his trip?

The required expression is : 150 + 21·m

Step-by-step explanation:

The initial miles on the odometer = 150 miles

Total time of trip = 3 weeks

= 3 * 7 = 21 days

No. of miles traveled each day = m miles

So, during whole trip no. of miles traveled by Jim = m * 21 miles

Therefore, expression for mileage will be : miles initially on the odometer + miles traveled during the trip

Therefore, Expression is 150 + 21·m