Please help it is important, please help ASAP

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.

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

The weight of an object in the water is 7% of its weight out of the water. what is the weight of a 652g object in the water?