# Say It With Symbols: Making Sense of Symbols by Glenda Lappan, James T. Fey, William M. Fitzgerald, Susan N.

By Glenda Lappan, James T. Fey, William M. Fitzgerald, Susan N. Friel, Elizabeth Difanis Phillips

• Soft-bound, 3-hole-punched to slot in scholars' binders
• 4-color with a fascinating Unit Opener, Investigations, log on net codes, ACE Homework, Mathematical Reflections, a Unit undertaking, in retrospect and looking out forward, and a word list of phrases in English and Spanish
• Available in English and Spanish

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Extra info for Say It With Symbols: Making Sense of Symbols

Example text

1 has the profit plan P = 5s - (100 + 2s). The school band also sells greeting cards. The equation for the band’s profit is P = 4s - 2(10 + s). Find the number of boxes that each group must sell to have equal profits. For Exercises 10–17, solve each equation for x without using tables or graphs. Check your solutions. 10. 8x + 16 = 6x 11. 8(x + 2) = 6x 12. 6 + 8(x + 2) = 6x 13. 4 + 5(x + 2) = 7x 14. 2x - 3(x + 6) = -4(x - 1) 15. 2 - 3(x + 4) = 9 - (3 + 2x) 16. 75(5 - 2x) = 26 17. 2 x + 4 = 3 x 1 2 18.

In the following graph, line O1 represents the income for selling n soccer balls. Line O2 represents the expenses of manufacturing n soccer balls. Soccer Ball Production and Sales Sales (thousands) \$6 \$5 \$4 ᐉ1 \$3 ᐉ2 \$2 \$1 0 500 1,000 1,500 2,000 2,500 3,000 3,500 Number of Soccer Balls a. What is the start-up expense (the expense before any soccer balls are produced) for manufacturing the soccer balls? NOTE: The vertical axis is in thousands of dollars. b. What are the expenses and income for producing and selling 500 balls?

The equation w = -275(2t - 7) represents the gallons of water w that remain in the pool t hours after pumping starts. a. How many gallons of water are pumped out each hour? b. How much water is in the pool at the start of pumping? c. Suppose there are 1,000 gallons of water left in the pool. How long has the pump been running? d. After how many hours will the pool be empty? e. Write an equation that is equivalent to w = -275(2t - 7). What information does it tell you about the situation? 3. A truck has a broken fuel gauge.