Story problems trigonometry can someone please answer if you do please show your work

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.

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

Im literally having a mental breakdown