Answer
$390$
Work Step by Step
$\sum_{i=1}^{15} (3i+1)=3 \times \sum_{i=1}^{15} i+\sum_{i=1}^{15} (1)$
$=3 \times \dfrac{(15) \times (15+1)}{2}+1 \times (15)$
$=3 \times \dfrac{(15) \times (16)}{2}+(1) \times (15)$
$=360+30$
$=390$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 13, Trigonometric Ratios and Functions - 13.3 Evaluate Trigonometric Functions of Any Angle - 13.3 Exercises - Mixed Review - Page 872: 51
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