9. A traffic study was conducted on a busy street. In 15-minute intervals from 6:30 a. m to 8:00 a. m., the number of vehicles that passed a certain point in one minute was recorded in the table
below. Write an equation for the curve of best fit, then approximate the number of cars that passed
the point at 9:15 a. m.
90
X 0 15 30 45 60
y 32 48 71 80 98
*x = minutes past 6:30 a. m.; y = number of cars
75
86
81