1. Algebra I Clear Targets: TSWBAT Solve 14 – 7(b + 2) = 16
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

2. Literal Equations Ratio: compares 2 numbers
Consider a class that has 25 students and 11 are boys.
The ratio of boys to total students is 11:25
b. What is the ratio of girls to boys?
Watch the order in which the ratios are asked for

3. Rates and Ratios Example
Ratio that compares quantities in
different measures.
Rate
Unit Rate
A rate with a denominator of 1.
Example
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.
Store A
Store B
Store C

4. Unit Rates and Proportions
A brand of apple juice costs $1.56 for 48 ounces. What is the unit rate?
Proportion: equality between ratios
Can cross multiply to find the unit rate.
48x = 1.56

5. Conversion factor is a ratio of 2 equal measures in different units.
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.

6. Conversion Rates Set up problem with conversion factors. 40 mi 1 h
The fastest recorded speed for an eastern gray kangaroo is 40 mi per hour. What is the kangaroo’s speed in feet per second?
Set up problem with conversion factors.
40 mi
1 h
5280 ft
1 mi
60 min
1 min
60 s •
Cross out like units and multiply.
The kangaroo’s speed is about 58.7 ft/s.

7. Conversion Rates
A student ran the 50 yd dash in 5.8 s. At what speed did the student run in mph?

8. Homework / Classwork Page 121 Problems
Conversion Rates
Homework / Classwork
Page 121
Problems
(1-4, 9, 10,11,14,17,20,23,24,26,28,30)