3.31

The average annual cost of operating a car is $1380 when it is driven 10,000 miles. The average annual cost of operating the car is $1860 when it is driven 13,000 miles. Find and interpret the slope of the line joining (10000,1380) and (13000,1860). The slope of the line joining the points (10000,1380) and (13000,1860) is. (Type an integer or a decimal.) Interpret the slope found in the previous step. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal.) O A. When the average annual cost of operating the car is between $1860 and $1380, the mileage of the car is mile(s) per dollar. O B. Between 10,000 and 13,000 miles driven, the average annual cost of operating the car is $ per mile