Intermediate Algebra (6th Edition)

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

Chapter 2 - Section 2.4 - Linear Inequalities and Problem Solving - Exercise Set - Page 87: 80a

Answer

Any year after (and including) 2041

Work Step by Step

$c = -9.4t +431$ c = # cigarettes t = # years after 2000 at most 50 billion cigarettes $50 \geq -9.4t + 431$ $50+9.4t-50 \geq -9.4t + 431+9.4t-50$ $9.4t \geq 381$ $9.4t/9.4 \geq 381/9.4$ $t \geq 40.53$ We want the next year, so $t = 41$
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