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55. the sum of the first 80 positive integers 56. the sum of the first 120 positive integers

55. the sum of the first 80 positive integers 56. the sum of the first 120 positive integers

Algebra & Trigonometry with Analytic Geometry
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter10: Sequences, Series, And Probability
Section10.3: Geometric Sequences
Problem 82E
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Solve question 55. Write out each step and explain what you are doing.
25 R Evaluate S10, the sum of the first ten terms, for each arithmetic sequenc 45. 8, 11, 14, 46. -9,-5, -1,... 47. 5 48. 8, 6, 4,... 49. a₂9, a4 = 13 50. a 51a₁ 51, a₁ = 10, a10 = 5.5 52. a₁-8, a10 = -1.25 53. a 54. Concept Check Is this statement accurate? To find the sum of the first n positive integers, find half the pro Evaluate each sum as described. See Example 7(b). 55. the sum of the first 80 positive integers 56. the sum of the first 120 positive integers 57. the sum of the first 50 positive odd integers 58. the sum of the first 90 positive odd integers 59. the sum of the first 60 positive even integers 60. the sum of the first 70 positive even integers Find a, and d for each arithmetic series. See Example 8. 61, $20= 1090, 420 = 102 63. S₁6-160, a16 = -25 65. S12= -108, a12 = -19 Dox 62. S315580, a31 64. S25= 650, 425" 66. S31620, 031-
Transcribed Image Text:25 R Evaluate S10, the sum of the first ten terms, for each arithmetic sequenc 45. 8, 11, 14, 46. -9,-5, -1,... 47. 5 48. 8, 6, 4,... 49. a₂9, a4 = 13 50. a 51a₁ 51, a₁ = 10, a10 = 5.5 52. a₁-8, a10 = -1.25 53. a 54. Concept Check Is this statement accurate? To find the sum of the first n positive integers, find half the pro Evaluate each sum as described. See Example 7(b). 55. the sum of the first 80 positive integers 56. the sum of the first 120 positive integers 57. the sum of the first 50 positive odd integers 58. the sum of the first 90 positive odd integers 59. the sum of the first 60 positive even integers 60. the sum of the first 70 positive even integers Find a, and d for each arithmetic series. See Example 8. 61, $20= 1090, 420 = 102 63. S₁6-160, a16 = -25 65. S12= -108, a12 = -19 Dox 62. S315580, a31 64. S25= 650, 425" 66. S31620, 031-
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