### Home > CC2 > Chapter Ch2 > Lesson 2.2.5 > Problem 2-91

2-91.

In parts (a) and (b) of problem 2‑89, the rectangular models for

For help drawing a diagram, see the online homework help for problem 2-90.

Mathematically, what do we mean when we say

What operation is being used? Does the order matter for this operation?