## Intermediate Algebra: Connecting Concepts through Application

a. $R=7.50(x)+250$ b. 1000 dollars c. $P=2.21x-150$ d. 71 dollars e. 68 photos
a. R=revenue, x=number of proofs $R=7.50(x)+250$ b. x=100 $R=7.50(100)+250$ $R=750+250$ $R=1000$ c. P=profit, C=cost (C=5.29(x)+400) $P=R-C$ $P=(7.50x+250)-(5.29x+400)$ $P=7.50x+250-5.29x-400$ $P=2.21x-150$ d. x=100 $P=2.21(100)-150$ $P=221-150$ $P=71$ e. P=0 $0=2.21(x)-150$ $0+150=2.21(x)$ $150=2.21(x)$ $150\div2.21=x$ $x=67.87$ so x=68