a. A student asks if 39 + 41 = 40 + 40, is it true that 39 • 41 = 40 • 40. How do you re...

a. A student asks if 39 + 41 = 40 + 40, is it true that 39 • 41 = 40 • 40. How do you reply?

b. Another student says that he knows that 39 • 41 40 • 40 but he found that 3941 = 40 • 40 — 1. He also found that . He wants to know if this pattern continues. How would you respond?