You take a 10-day trip across the country by car. At the beginning of the trip you zero the odometer and every evening you write down the odometer reading. At the end of the trip you make a graph of cumulative miles travelled vs. the day the measurement was taken. Which of the following do you think is true? a) The mileage is the independent variable and the day is the dependent variable. b) The day is the independent variable and the mileage is the dependent variable. c) Neither variable is independent or dependent. The image to the right is an odometer, which measures the number of miles traveled based on the rotation of the car's wheels. This car traveled 91,308