College Algebra (6th Edition)

Published by Pearson
ISBN 10: 0-32178-228-3
ISBN 13: 978-0-32178-228-1

Chapter 8 - Sequences, Induction, and Probability - Exercise Set 8.2 - Page 727: 83


320 Degree Days

Work Step by Step

1. Degree days in January 1 = 23 Degree days in January 2 = 25 The temperature rose 2 degrees for every day 2. Thus the sequence in 23,25,27 ... 41 Use Formula for adding numbers in a series $Sum_{n} =\frac{n}{2}(a_{1}+a_{n}) $ In other words, add the last number and the 1st number and then multiply that by the total number of numbers in the sequence, and divide that by 2 $Sum_{10} =\frac{10}{2}(23+41) $ = $5\times64$ = 320
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