The table shows speedometer readings at 10-second intervals during a 1-minute period for a car racing at the Daytona International Speedway in Florida. a Estimate the distance the race car traveled during this Time s Velocity mi/h 0 182.9 10 168.0 20 106.6 30 99.8 40 124.5 50 176.1 60 175.6 time period using the velocities at the beginning of the time intervals. b Give another estimate using the velocities at the end of the time periods. c Are your estimates in parts a and b upper and lower estimates? Explain.