C5_3_16_TWMM_Investigation3 March 16, 2011
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- Berniece Harmon
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1 Mr. Cordova lives in Detroit, Michigan. He often travels to Baltimore, Maryland, to visit his grandfather. The trip is 500 miles each way. Here are his notes for his trips to Baltimore last year. A. 1. Calculate the average speed in miles per hour for each trip. Record the results in a table like this. y Travel Average 350 Time Speed (hours) (mph) x Plot the data. Draw a line or curve that models the data pattern. Describe the pattern of change in average speed as travel time increases. You can use a graphing calculator and then sketch the graph in your notes. 3. Write an equation for the relationship between travel time t and average speed s. 4. Use your equation to find the average speed for 500 mile trips that take 6 hours, 8 hours, 12 hours, and 16 hours. 5. Add the travel time, average speed data from part 4 to your graph. Do the new points fit the graph model you sketched for the original data?
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3 B. The Cordova family is planning a trip to Mackinac Island mak uh naw near the upper peninsula of Michigan. Mr. Cordova does some calculations to see how the travel time will change if the family drives at different average speeds. 1. How far is it from Detroit to Mackinac Island? 2. What equation relates travel time t to average speed s? 3. Describe the pattern of change in the travel time as the average speed increases. How would that pattern appear in a graph of the data? How is it shown by your equation? 4. Predict the travel times if the Cordovas drive at average speeds of 45 miles per hour and 65 miles per hour.
4 C. Suppose Mr. Cordova decides to aim for an average speed of 50 miles per hour for the trip to Mackinac Island. 1. Make a table and graph to show how the distance traveled will increase as time passes. Show times from when the family leaves home to when they reach their destination. 2. Write an equation for the distance d the family travels in t hours. 3. Describe the pattern of change in the distance as time passes. 4. Compare the time, distance traveled graph and equation with the time, average speed graphs and equations in Questions A and B. Time (Hours) Distance Traveled (miles) 1000 y x
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6 Homework: Page 54: 4-7
7 For Exercises 4 7, tell whether the relationship between x and y is an inverse variation. If it is, write an equation for the relationship.
8 The science teachers at Everett Middle School want to take their eighth graders on an overnight field trip to a nature center. It costs $750 to rent the center facilities.the school budget does not provide funds to rent the nature center, so students must pay a fee.the trip will cost $3 per student if all 250 students go. However, the teachers know it is unlikely that all students can go.they want to find the cost per student for any number of students. A. 1. Write an equation relating the cost c per student to the number of students n. 2. Use your equation to make a graph showing how the cost per student changes as the number of students increases. B. 1. Find the change in the cost per student as the number of students increases from a. 10 to 20 b. 100 to 110 c. 200 to How do your results show that the relationship between the number of students and the cost per student is not linear? C. 1. Find the change in the per student cost as the number of students increases from a. 20 to 40 b. 40 to 80 c. 80 to Describe the pattern in your results. Explain how your equation from Question A shows this pattern. D. The science teachers decide to charge $5 per student for the trip.they will use any extra money to buy science equipment for the school. 1. Write an equation for the amount a the teachers will collect if n students go on the trip. 2. Sketch a graph of the relationship. 3. Is this a linear relationship or an inverse variation? Explain.
9 Homework Page 56: 11
10 11. Testers drive eight vehicles 200 miles on a test track at the same speed.the table shows the amount of fuel each vehicle uses. Fuel Used (gallons) Miles per gallon a. Find the fuel efficiency in miles per gallon for each vehicle. b. Make a graph of the fuel used, miles per gallon data. Describe the pattern of change shown in the graph. c. Write a formula for calculating the fuel efficiency based on the fuel used for a 200 mile test drive. d. Tell how the fuel efficiency changes as the amount of fuel used increases from 5 to 10 gallons. From 10 to 15 gallons. From 15 to 20 gallons. e. How do the answers for part d show that the relationship between the fuel used and the fuel efficiency is not linear?
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