¿Qué se requiere para sumar o restar dos matrices?

Does anyone know of a quizlet or something for edmentrum /plato algebra 1

Acircular city park has a sidewalk directly through the middle that is 111 - feet long. if each bag of fertilizer covers 50 square feet, then determine how many bags of fertilizers the parks and recreation department needs to use to cover the circular park. ignore all the sidewalks around and through the park.

Issof claims that the scale factor is 1/2. which statement about his claim is correct