Can you guys help me solve this ?

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.

How can you find the magnitude of a vector, v = < x,y > , where the horizontal change is x and the vertical change is y?

What does the pair of equations y = 1, z = 8 represent? in other words, describe the set of points (x, y, z) such that y = 1 and z = 8?