Intermediate Algebra (6th Edition)

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

Chapter 8 - Section 8.2 - Solving Quadratic Equations by the Quadratic Formula - Exercise Set - Page 494: 88a

Answer

55.6 million

Work Step by Step

We use the quadratic $c(x)=-.4x^2+21x+35$ to model the number of phone wifi-enabled cellphones, in millions. First, we plug in 1 to obtain the answer: 55.6
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