Answer
$n=15$
Work Step by Step
Given that $50+2(n-1)=78$
$\implies 2(n-1)=78-50$
$\implies 2n-2=28$
$\implies 2n=28+2$
$\implies 2n=30$ or $n=\frac{30}{2}=15$
Intermediate Algebra: Connecting Concepts through Application
by Clark, Mark; Anfinson, Cynthia
Published by
Brooks Cole
ISBN 10:
0-53449-636-9
ISBN 13:
978-0-53449-636-4
Chapter 9 - Conic Sections, Sequences, and Series - Chapter Review Exercises - Page 756: 45
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