# Chapter 1 - Linear Functions - 1.1 Solving Linear Equations - 1.1 Exercises - Page 13: 36

a. $R=7(x)+50$ b. 190 dollars c. $P=5.5(x)-180$ d. 40 dollars e. 33 windows

#### Work Step by Step

a. R=revenue, x=number of windows cleaned $R=7(x)+50$ b. x=20 $R=7(20)+50$ $R=140+50$ $R=190$ c. $P=(7-1.50)x+(50-230)$ $P=5.5(x)-180$ d. x=40 $P=5.5(40)-180$ $P=220-180$ $P=40$ e. P=0 $0=5.5(x)-180$ $0+180=5.5(x)$ $180=5.5(x)$ $180\div5.5=x$ $x=32.72$ $x=33$

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