Please explain/answer this question!

Which statement best describes the polynomial

Ahome improvement store rents it’s delivery truck for $19 for the first 75 minutes and $4.75 for each additional 1/4 hour. if a customer rented the truck at 11: 10 am and returned the truck at 1: 40 pm the same day, what would his rental cost be?

If the discriminant if a quadratic equation is 4 which statement describes the roots?