If the perimeter is 74mm and the width 16mm what is the length

The total number of students in gina’s after-school program is .the number of students who have 4 or more siblings is .reset next

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.

Math i have no idea how to do a and b