Please help I will mark you BRAINLIST help me with 17, 18, 19 and 20 please I need this thank you!!

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.

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

Laura read 1/8 of a comic book in 2 days. she reads the same number of pages every day. what part of the book does she read in a week