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Friday: Quiz Friday: Grades close (ALL HOMEWORK IS DUE) e t abl o: : will be l a Go ay I ates r d o d T s an ions o i t d ra roport n i F e p v l o S : a nd e g A o w s s ion t a u q e ing lv vie e R tes No 1 Ex. 3 Suppose you walk 2 miles in 35 minutes. a. Find the average walking speed. b. Write a rule to describe the distance, d, that you walked as a function of the time, t, you walk. c. Use the function to find how far you would walk in an hour. 2 Converting Rates To change one unit of measure to another, use rates that equal 1. Rates that equal 1: 1 mile 5280 ft Ex. 4 Express each rate in miles per hour. a. 1 mile in 6 minutes Ex. 5 b. 1 mile in 200 seconds A sloth travels 0.15 miles per hour. Convert this speed to feet per minute. Homework: Pg 146 # 7, 8, 3843 3 Proportions A ____________________ is an equation that states that two rates are ___________ ex. or Ex. 6 Using the Multiplication Property of Equality a. x 5 9 6 Property: Cross Products of a Proportion If a b ex. 2 3 Proof: If a b c d 8 12 c d then ad = bc so 2 12 = 3 8 then ad = bc 4 Ex. 7 Solve the proportion by using cross products a. 25 12 c. x 4 x + 2 x 14 10 b. 7 y d. 5 24 3 5 w + 6 w 4 HW: Pg 5 6