Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 1 - Section 1.7 - Modeling with Equations - 1.7 Exercises - Page 76: 33

Answer

40 years old

Work Step by Step

Lets denote his daughter's age from seven years ago x. At that time his age was 11x. Today he is four times older than his daughter 4(x+7), we write x+7 because x is her age from seven years ago and in order to express her age these days we have to add seven. 11x+7=4(x+7) 11x+7=4x+28 7x+7=28 7x=21 x=3 11$\times$3+7=40
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