9. On Tuesday, Donovan earned \( \$ 11 \) for 2 hours of babysitting. On Saturday, he babysat for the same family and earned \( \$ 38.50 \). How many hours did he babysit on Saturday?

To find out how many hours Donovan babysat on Saturday, we first determine his hourly rate from the time he babysat on Tuesday. He earned \( \$ 11 \) for 2 hours, which gives us an hourly rate of: \[ \text{Hourly Rate} = \frac{11}{2} = 5.5 \text{ dollars per hour} \] Now, we can use this hourly rate to find the number of hours he worked on Saturday. He earned \( \$ 38.50 \) that day, so we set up the equation: \[ \text{Hours Worked} = \frac{\text{Earnings}}{\text{Hourly Rate}} = \frac{38.50}{5.5} \] Calculating this gives: \[ \text{Hours Worked} = 7 \text{ hours} \] So, Donovan babysat for 7 hours on Saturday.