3. State whether each sequence is arithmetic or geometric, and then find the explicit and recursive formulas for each sequence. Formulas:

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expressions 4s +9s represents the total number of items that will be displayed on s shelves. simplify this expression

Twelve less than a number is at most 20

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length