Carla packed this box with 1-centimeter cubes. What is the volume of the box?

Well i cannot see the box ... but I can tell you how to solve the exercise.

Imagine the box has height H, width W and Length L

The volume of said box would be V = H*W*L

Now imagine that Carla's box was similar to this one.

And she filled this box with 1 cm cubes, assuming the height to be 3 cm.

V = (number of cubes height) * (number of cubes width) * (number of cubes length) = 3 * 3 * 5 cubic cm = 45 cubic cm