A group of students wants to put mulch in some flower beds near their school. It will take 100 cubic feet to mulch the entire flower bed. Company A sells bags of mulch for $2 per cubic foot. Company B will deliver a truckload at $1.50 per cubic foot, but charges a $50 delivery fee. Write an equation to model each situation. Then decide which company should be used. Are there other factors to consider other than cost? Explain your thinking.