In Exercises 78, use the following matrices and find an elementary matrix E that satisfies the stated equation. A = 341 2 7 1 815 , B = 815 2 7 1 341 C = 341 2 7 1 2 7 3 , D = 8 15 6 21 3 3 41 F = 815 811 341 (a) EB = D (b) ED = B (c) EB = F (d) EF = B

Chapter 1 Summary 1.1 The Real Number System Common Subsets of Real Numbers p. 34 The sets N, Z, Q, and R, as well as whole numbers and irrational numbers N: Natural Numbers (or Counting) N= {1, 2, 3, 4, 5, …} The set is infinite, so in list form we can write only the first few numbers. Whole: {0, 1, 2, 3, 4, 5, …} Whole numbers are natural...