Determine the equation of the circle that contains the point a(1,-3) , b(3,3), c(9,1)

The late fee for library books is $2.00 plus 15¢ each day for a book that is late. if maria’s fee for a late book was $3.20, write and solve a linear equation to find how many days late the book was.

Can someone me and do the problem plz so i can understand it more better

What is the range for 31,39,29,34,37,24,36,33,34,28