Answer
$50 per phone
Work Step by Step
$(500+20x)(75-x)$
$37500-500x+1500x-20x^2$
$-20x^2+1000x+37500$
$-b/2a = -1000/2*-20$
$-b/2a = -1000/-40 = 25$
$x=25$
$75-25=50$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 9 - Quadratic Functions and Equations - 9-2 Quadratic Functions - Practice and Problem-Solving Exercises - Page 545: 35
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