## Precalculus (6th Edition) Blitzer

Published by Pearson

# Chapter 1 - Section 1.7 - Combinations of Functions; Composite Functions - Exercise Set - Page 259: 98

#### Answer

a. $-0.04x+5.8$ million b. $4.8$ million. c. underestimates by 0.2 million.

#### Work Step by Step

a. For the difference between the female and male populations, we have $D(x)=F(x)-M(x)=1.44x+120.9-(1.48x+115.1)=-0.04x+5.8$ million b. For year 2010, we have $x=2010-1985=25$ and $D(25)=-0.04(25)+5.8=4.8$ million. c. Reading from the bar graph, we have $D_1=157-152=5$ million. Thus, the result from part-b underestimates the true value by 0.2 million.

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