Bicycle rentals cost $5.00 per hour for an adult and $2.50 per hour for a child.
 A family with one adult and 2 kids decide to rent bicycles.
 Which equation represents the relationship between the cost in dollars
 for the family, c, and the time they rent the bicycles in hours, t? 
 A) c = 5.00t + 2.50
 B) c = 7.50t
 C) c = 5.00 + 2.50t
 Dc = 10.00t