What is the formula for finding the volume of a rectangular prism

Which of the following is a rectangular prism?

A cardboard box has a length of

$$3\ \frac{1}{2}$$  feet, a width of  $$2\ \frac{5}{6}$$  feet, and a height of  $$1$$   foot. What is the volume of the box?

What is the volume of this rectangular prism?

Find the volume of this rectangular prism.

How do you feel about finding the volume of rectangular prisms with fractional edge lengths?

Great!?

So-So??

Lost in the sauce???