1.solve 14 – 7(b + 2) = 16 2.bricklayers use the formula n = 7lh to estimate the number (n) of...
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1. Solve 14 – 7(b + 2) = 16
2. Bricklayers use the formula n = 7Lh to estimate the number (n) of bricks needed to build a wall.
a. Solve the formula for h. b. Estimate the height of the wall 28 ft long and
requires 1568 bricks.
Clear Targets: TSWBAT Convert rates and unit measures Use ratios to compare 2 numbers
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Literal Equations
Consider a class that has 25 students and 11 are boys.a.The ratio of boys to total students is 11:25b. What is the ratio of girls to boys?
Watch the order in which the ratios are asked for
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Ratio that compares quantities in different measures.
Rates and Ratios
A rate with a denominator of 1.
Which store offers the best deal?
Store A: $25 for 2 shirts; Store B: $45 for 4 shirt; Store C: $30 for 3 shirts.
Write each price as a ratio, then as a unit rate to compare.
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A brand of apple juice costs $1.56 for 48 ounces. What is the unit rate?
Unit Rates and Proportions
Proportion: equality between ratiosCan cross multiply to find the unit rate.
48x = 1.56
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Conversion Rates
Conversion factor is a ratio of 2 equal measures in different units.
Convert 63 yds. to feet
1. Choose appropriate conversion factor.
2. Set up problem.
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Conversion Rates
The fastest recorded speed for an eastern
gray kangaroo is 40 mi per hour. What is the
kangaroo’s speed in feet per second?
40 mi1 h
5280 ft1 mi
1 h 60 min
1 min60 s
• ••
The kangaroo’s speed is about 58.7 ft/s.
Set up problem with conversion factors.
Cross out like units and multiply.
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Conversion Rates
A student ran the 50 yd dash in 5.8 s. At what speed did the student run in mph?
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Conversion Rates
Homework / Classwork
Page 121Problems
(1-4, 9, 10,11,14,17,20,23,24,26,28,30)