A group of n friends is going to drive together to a big city to have lunch, visit a museum, and have dinner. They expect to spend $15 for gasoline, $20 for parking, $8 each for lunch, $11 each for tickets to the museum, and $12 each for dinner. The expression below represents the total number of dollars they expect to spend. 15 +20 + 8n +11n +12n The expression can be simplified as 35 +31n. Which statement explains the meaning of this simplified expression?