Camila built a rectangular vegetable garden, as shown in the figure.
12 ft.
4 ft.

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

This is so hard and it’s for a test

Aregular pentagon with a perimeter of 21 inches is dilated by a scale factor of 5/3 to create a new pentagon. what is the perimeter of the new pentagon?