Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 11 - Review - Page 668: 40

Answer

4th year—23 cranes born 46 cranes in the first four years

Work Step by Step

$a_n=n^2+2n-1$ 4th year $n=4$ $a_n=n^2+2n-1$ $a_4=4^2+2*4-1$ $a_4 =16+8-1$ $a_4 = 23$ 4th year—23 cranes born First 4 years $n=1$ $a_n=n^2+2n-1$ $a_1=1^2+2*1-1$ $a_1=1+2-1$ $a_1=2$ $n=2$ $a_n=n^2+2n-1$ $a_2=2^2+2*2-1$ $a_2=4+4-1$ $a_2=7$ $n=3$ $a_n=n^2+2n-1$ $a_3=3^2+2*3-1$ $a_3 =9+6-1$ $a_3=14$ $2+7+14+23$ $46$ 46 cranes in the first four years
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