Answer
See below.
Work Step by Step
$u_1=1$
$u_2=u_1+(1+1)=1+2=3$
$u_3=u_2+(2+1)=3+3=6$
$u_4=u_3+(3+1)=6+4=10$
$u_5=u_4+(4+1)=10+5=15$
$u_6=u_5+(5+1)=15+6=21$
$u_7=u_7+(6+1)=21+7=28$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 9 - Section 9.1 - Sequences - 9.1 Assess Your Understanding - Page 649: 97
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