3 - 15 36. 4 - 20 92. 8 - 3[-2(5 - 7) - 5(4 - 2)] 37. 8 - (- 10) 38. 7 - (-13) 39. -20 - (-5) 40. -30 - (-10) 93. 1 1 41. - 4 2 1 2 42. - 10 5 95. 43. 8) 44. 7) 45. 0 - (- 22) 46. 0 - (- 23) 96. 47. 9(- 10) 48. 8(-10) 49. (- 3)(- 11) 50. (- 7)(- 11) 51. 15 (- 1) 13 52. 11 (-1) 13 53. - 22 # 0 55. (- 4)(- 2)(- 1) 54. - 23 # 0 57. 2(- 3)(-1)(- 2)(- 4) 58. 3(- 2)(- 1)(-5)(-3) 2(-2) - 4(-3) 5 - 8 59. (-10)2 60. (- 8)2 61. -102 62. -82 63. (-2)3 64. (- 3)3 (5 - 6)2 - 2 3 - 7 89 - 3 # 52 12 , 3 # 5 22 + 32 94.

4 Ch a p t e r 1 Algebra, Mathematical Models, and Problem Solving Many algebraic expressions involve exponents. S. smartphone users, in millions, x years after 2007. ” The exponent, 2, indicates that the base, x, appears as a factor two times. Exponential Notation If n is a counting number (1, 2, 3, and so on), Exponent or Power bn= b � b � b � . . � b. Base b appears as a factor n times. ” Thus, the nth power of b is defined as the product of n factors of b. The expression bn is called an exponential expression.

Campuses facebooking, tweeting, and partying their way to selling things vital and specific to college students. Call it New World College Marketing 101. How much do college students have to spend? In this section’s Exercise Set (see Exercises 147–148), you’ll be working with a model that addresses this question. In order to use the model, we need to review operations with real numbers, our focus of this section. 7 Divide real numbers. 8 Use the order of operations. 9 Use commutative, associative, and distributive properties.