Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter P - Review Exercises - Page 142: 23

Answer

$55\%$, same

Work Step by Step

Step 1. Use the given formula $D=0.005x^2+0.55x+34$ with $x=2010-1980=30$. We have $D=0.005(30)^2+0.55(30)+34=55$ Step 2. Read from the bar graph the index number for year 2010. We get a value of $55$. Step 3. We conclude that the index number from the model is exactly the same as the data from the bar graph.
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