## Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole

# Chapter 1 - Linear Functions - 1.1 Solving Linear Equations - 1.1 Exercises: 13

#### Answer

a. 4178 homicides of 15- to 19-year-olds in the U.S. in 1992. b. 1019 homicides of 15- to 19-year-olds in the U.S. in 2002. c. 1998.

#### Work Step by Step

a. $N=-315.9t + 4809.8$ with $t=2$ $N=-315.9(2) + 4809.8$ $N=-631.8 + 4809.8$ $N=4178$ b. $t=2002 - 1990$ so $t=12$ $N=-315.9(12) + 4809.8$ $N=-3790.8 + 4809.8$ $N=1019$ c. $N=7337$ $7337=315.9(t) + 4809.8$ $7337-4809.8=315.9(t)$ $2527.2=315.9(t)$ $2527.2\div315.9=t$ $t=8$ $1990 + 8 = 1998$

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