Respuesta :
Jackie babysat for 8 hours on Saturday and she charges 7 dollars per hour.
Since Jackie earned $21 for 3 hours we divide 21 by 3 and we get 7 so she charges $7 per hour. With this information we divide 56 by 7 and get 8 so she babysat for 8 hours. This leads to the conclusion that Jackie babysat for 8 hours on Saturday and she charges 7 dollars per hour.