3.4 (Day 1).notebook
October 31, 2013
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3.4 (Day 1).notebook
October 31, 2013
Today I will be able to: Find rates and ratios and solve proportions
3.4 (Day 1) Ratios and Proportions
Ratio: A comparison of two numbers by division
ex. ratio of a to b is
If a and b represent quantities measured in different units, then the ratio of a to b is a ______________
ex. A _________________ is a rate with a denominator of 1.
ex. Find the unit rate. Ex. 1
Ex. 2
$260 for 8 days
Florist A sells two dozen roses for $24.60. Florist B sells six roses for $7.50. Find the unit rate (cost per rose) for each. Which florist has the lower cost per rose?
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3.4 (Day 1).notebook
October 31, 2013
Today I will be able to: Find rates and ratios and solve proportions
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. 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. 3