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

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

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.

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

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.

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.

Conversion Rates

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

Conversion Rates

Homework / Classwork

Page 121Problems

(1-4, 9, 10,11,14,17,20,23,24,26,28,30)