Week 3

• More on working with percents
• Percent increase
• Linear functions and rates of change
• Slope

• Lab Handout, Week 3
• Calculating Tips Spreadsheet
• Completed Tips Spreadsheet
• Graphit Activity

Due at beginning of class:

Provide three examples of percent decrease and / or percent increase in a real world context. Each example should contain the following information:

1. A description of the context
2. The original quantity before the increase / decrease
3. The percent of the increase or decrease
4. The amount after the increase or decrease

In class work:

• On a note card write a word problem that involves finding the percent of a number and provide the solution.
• Informal completion of the lab.

Homework: Record the price of 3 of the different gasolines sold at one station close to where you live. (Generally this will be 87 octane, 89 octane, and 92 octane.) You will create a graph that represents each of the three prices of gasoline for different amounts of gasoline purchased. Create these 3 graphs on the same coordinate axes. Be sure to include the following:

1. Either use graph paper or a graphing program such as the Graphit activity or Excel.
2. The horizontal axis should be labeled and represent the number of gallons of gas.
3. The vertical axis should be labeled and represent the amount in dollars spend for the corresponding gallons of gas purchased.

1. Calculate the slope for each line.
2. What is the equation for each line?
3. What does the slope represent for each line?