Answer: Doing the volume formula, L x W x H, and she would need 810 boxes
Explanation: To find volume, we need to do the volume formula for a rectangular prism, L x W x H. In this case, we multiply 10 x 9 x 9.
10 x 9 x 9 = 810.
So Tammy would need 810 unit boxes that each measure 1 cubic foot.