You can model the arch of a building entrance by using the equation y= −1/3(x+6)(x−6), where x and y are measured in feet. The x-axis represents the ground. Find the width of the arch at the ground.

Susan is paying $0.30 per $100 on her $483,000 home in homeowners insurance annually. if her annual homeowners insurance premium is divided into twelve equal monthly installments to be included on each of her monthly mortgage payments of $2,128.00, what is her total monthly payment?