9 4 Arithmetic Series - PC\ MAC

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Alg2Hon 9 4 and 9 5 Notes and answers.notebookMay 20, 20139 4 Arithmetic SeriesAn arithmetic series is an indicated sum of theterms of an arithmetic sequence.A finite series has a first term and a last term.An infinite series continues without end.To find the sum of a finite arithmetic series use . . .where n is the number of terms.Oct 27 9:07 AMExample 1. (p. 588) Got It? 1aWhat is the sum of the finite arithmetic series4 9 14 19 24 . . . 99?How to find n (the number of terms)1. Find common difference (d)2. Subtract last term first term3. Divide by d4. Add 1 (to count first term)May 19 9:07 PM1

Alg2Hon 9 4 and 9 5 Notes and answers.notebookMay 20, 2013Example 2What is the sum of the finite arithmetic series14 17 20 23 . . . 116?You can also use the formula for the nth termin an arithmetic sequence to find n.an a1 (n 1)dMay 19 9:10 PMan a1 (n 1)dExample 3 (p. 588) Got It? 2.A company pays a 5,000 bonus if a new salesperson makes 10 sales inthe first week and then improves by one sale per week each weekthereafter. One salesperson qualified for this bonus with the minimumnumber of sales. How many sales did the salesperson make in week50? In all 50 weeks?May 19 9:16 PM2

Alg2Hon 9 4 and 9 5 Notes and answers.notebookMay 20, 2013Sigma Notation(Denotes the sum of a series)Oct 27 9:07 AM(p. 589)May 19 9:22 PM3

Alg2Hon 9 4 and 9 5 Notes and answers.notebookExample 4 (p. 589) Got It? 3What is summation notation for the series?a. 5 2 9 16 . . . 261 268May 20, 2013an a1 (n 1)db. 500 490 480 . . . 20 10May 19 9:40 PMExample 5Evaluatea.b.Oct 27 9:07 AM4

Alg2Hon 9 4 and 9 5 Notes and answers.notebookMay 20, 2013(p. 589)If the explicit formula is not linear, then you can evaluate thesum by adding the terms.Example 6 (p. 590) Got It? 4b 4cMay 19 9:50 PM9 5 Geometric SeriesA geometric series is an indicated sum of the terms ofa geometric sequence.To find the sum of a finite geometric series use . . .Oct 27 9:07 AM5

Alg2Hon 9 4 and 9 5 Notes and answers.notebookMay 20, 2013Example 1Evaluate the sum of the finite geometric seriesa. (p. 599) 8. 1 2 4 8 . . . 128Nth term in a Geometric Sequencean a1rn 1b. (p. 599) 10. 3 6 12 24 48 . . . 768May 20 10:18 AMExample 2 (p. 596) Got It? 1bWhat is the sum of the finite geometric series?May 20 10:22 AM6

Alg2Hon 9 4 and 9 5 Notes and answers.notebookMay 20, 2013Example 3 (p. 597) Got It? 2May 20 10:24 AMInfinite Geometric Series An infinite geometric series is the sum of a geometricseries with r 1 (that is, 1 r 1 ) An infinite geometric series for which r 1( that is, r 1 or r 1), does not have a sum (thesum does not exist)Oct 27 9:07 AM7

Alg2Hon 9 4 and 9 5 Notes and answers.notebookMay 20, 2013Find the sum of the infinitie geometric series, if it exists.1. a1 4, r 5/72. 1 2/3 4/9 3.4. The sum of an infinite geometric series is 81, and its commonration is 2/3. Find the first three terms of the series.Oct 27 9:07 AMRepeating DecimalsWrite 0.16666666 as a fraction.Oct 27 9:07 AM8

9 4 Arithmetic Series An arithmetic series is an indicated sum of the terms of an arithmetic sequence. A finite series has a first term and a last term. An infinite series continues without end. To find the sum of a finite arithmetic series use . . . where n is the number of terms. May 19 9:07 PM

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