Two dump trucks hauling rock to a construction site is given by the expression. xP + yQ P + Q Truck 1 can haul x cubic yards and truck 2 can haul y cubic yards. Truck 1 makes P trips to the construction site, while truck 2 makes Q trips. What does P + Q represent in the expression? A) rock delivered by truck 1 Eliminate B) rock delivered by truck 2 C) total trips made by truck 1 and 2 D) total rock delivered by truck 1 and 2