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7-4 Solving Proportions

7-4 Solving Proportions Cross Products in proportions are equal. (you get the same answer when you cross multiply) To solve a proportion, cross multiply to write an equation, then solve the equation. Example: x 72

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7-4 Solving Proportions

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  1. 7-4 Solving Proportions Cross Products in proportions are equal. (you get the same answer when you cross multiply) To solve a proportion, cross multiply to write an equation, then solve the equation. Example: x72 9 189 189x = (72)(9) 189x = 648 189 189 x = 3.428 = Additional examples can be found on pages 356-357 in the text book. 7-3 Analyzing Units Use the conversion sheet that Mr. Scott gave you in class on 1/4/2012. To convert units, multiply by one or more ratios of equal quantities called conversion factors. Memorie walks 2 feet per second. How many miles per hour is this? 1 mile2 feet60 seconds60 minutes = 5280 feet 1 second 1 minute 1 hour 7200 = 1.36mph 5280 × × ×

  2. Example: Mitchell eats 12 lbs. of bologna each year. How many ounces per week is that? 1 year 12 lbs16 ounces 52 weeks 1 year 1 lb. = 192 = 3.69 oz/week 52 x x Additional examples on pages 350-352 in the textbook. HOMEWORK 1/4/12: p. 344 #12-20 even p. 348 #2-10 even p. 353 #1-15 odd p. 358 #15-27 odd

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