What does 1/3 represent for the picture below?

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.

Multiplying an even number of negative numbers gives an answer that is choose from:

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²