Hi Andy,

This exercise is a matching exercise, so you have to match the expressions on the left column with their expanded form on the right column. For these types of exercises, you can click and drag the items in the right column to rearrange them. You do not need to provide any keyboard input for these types of exercises.

For example, you would click on the "4 x 4 x 4" option and drag it to the second position from the top, so that it aligns with 4^3 on the left column.

I hope this helps! Please let me know if you have any further questions!