A monkey and a crocodile
great friends.

The answer is ARE.

Explanation:

Are is a conjunction that is used to connect two words together to make sense.

This sentence you just made needed are to complete it.

we know that, volume of a rectangular prism is given by :

✿   {length × width × height}

given : the length of rectangular prism = 5.5

given : the width of rectangular prism = 6

given : the height of rectangular prism = 3

⇒ the volume of given rectangular prism = {5.5 × 6 × 3}

⇒ the volume of given rectangular prism = 99