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Write an inequality. 4000 Յ 9x ϩ 4y Յ 6000 You can write this compound inequality as two inequalities, 4000 Յ 9x ϩ 4y and 9x ϩ 4y Յ 6000. Solve each part for y. 4000 Յ 9x ϩ 4y and 9x ϩ 4y Յ 6000 4000 Ϫ 9x Յ 4y 9 4 1000 Ϫ ᎏᎏx Յ y 4y Յ 6000 Ϫ 9x 9 4 y Յ 1500 Ϫ ᎏᎏx Graph each boundary line and shade the appropriate region. The graph of the compound inequality is the area in which the shading overlaps. y 1500 Grams of 1000 Carbohydrate and Protein 500 b. Name three combinations of fat or carbohydrates and protein that meet the Calorie requirements.

See p. A56 for Chapter 1 Project EB E D Explain why your answer is correct. LD Unit 1 WI 1. If [f ‫ ؠ‬g](x) ϭ 4x2 Ϫ 4, find f(x) and g(x). W W TELECOMMUNICATION Is Anybody Listening? • Research several telephone long-distance services. Write and graph equations to compare the monthly fee and the rate per minute for each service. • Which service would best meet your needs? Write a paragraph to explain your choice. Use the graphs to support your choice. PORTFOLIO Select one of the functions you graphed in this chapter.

The stadium features Internet kiosks, a four-story scoreboard, a retractable roof, and dozens of espresso vendors. Suppose a vendor sells 216 regular espressos and 162 large espressos for a total of $783 at a Monday night game. a. On Thursday, 248 regular espressos and 186 large espressos were sold. Is it possible that the vendor made $914 that day? Explain. b. On Saturday, 344 regular espressos and 258 large espressos were sold. Is it possible that the vendor made $1247 that day? Explain. 34. Economics The table shows the closing value of a stock index for one week in February, 1999.

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Precalculus with Applications by Glencoe


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