1. Bell Ringer 3-28-11 A recipe for 12 waffles calls for cups of milk, cups of flour, and cups of other ingredients. 1. How many cups of milk, flour, and other ingredients are needed to make 36 waffles? 2. If the recipe is doubled, how many cups of milk, flour, and other ingredients are needed? 3. Mr. Loya stated that the circumference of Earth at the equator is 24,902.4 miles. Write the expression that represents this number in scientific notation?

2. A recipe for 12 waffles calls for cups of milk, cups of flour, and cups of other ingredients. 1. How many cups of milk, flour, and other ingredients are needed to make 36 waffles? 2. If the recipe is doubled, how many cups of milk, flour, and other ingredients are needed?

3. 3. Mr. Loya stated that the circumference of Earth at the equator is 24,902.4 miles. Write the expression that represents this number in scientific notation?

4. Quiz 3-28-11 The students in Mr. Lee’s science class are ordering materials they will need for a science experiment. Each student will need a bag of plant seeds that costs $1.00 and a 6-plant tray that costs $3.50. If x represents the number of students in Mr. Lee’s science class, which equation can be used to find y, the amount in dollars spent by Mr. Lee’s students? A. y = 3.5x + 1 B. y = 4.5x C. y = x + 4.5 D. y = x + 3.5

5. Which equation can be used? Since each student needs $1 for the seeds and $3.50 for the tray, I added the two amounts together. Each student needs $4.50. To find the total cost, you would multiply the cost per student by the number of students. The students in Mr. Lee’s science class are ordering materials they will need for a science experiment. Each student will need a bag of plant seeds that costs $1.00 and a 6-plant tray that costs $3.50. If x represents the number of students in Mr. Lee’s science class, which equation can be used to find y, the amount in dollars spent by Mr. Lee’s students? Equation B can be used to find the total cost. Seeds = $1.00/student Plant tray = $3.50/student x = # students y = Total money needed

6. Speed Test 1. Get out a dry erase marker. 2. You have 1 minute to complete as many problems as you can. 3.We will grade in 1 minute. 4. Graph your results. Keep the graph in your notebook. 5. We will do this every day.

7. Problem of the Week #5-3 1. You have 5 minutes to work on the problem of the week and word problem. 2. The problem of the week must follow the Read, Think, Solve, Justify format. 3. When you are finished, turn them in. 4. They are due Friday.

8. Reach for the Stars Monday A right triangle with leg lengths of 6 and 8 inches is dilated by a scale factor of 3.5 to produce a new right triangle. What is the perimeter of the new triangle? A. 49 in B. 24 in C. 84 in D. 59 in

9. Reach for the Stars Monday The Sundown Parking Garage charges $5.00 to park a car for the first hour and $0.75 for each additional hour or part of an hour after the first hour. What is the total charge for parking a car for 4 hours 42 minutes in this garage? A. $5.75 B. $6.50 C. $7.25 D. $8.00

10. Reach for the Stars Monday Which table best represents the equation shown below? y = 2x + 3

11. Class Work: Sampling You need your notes. Title the notes: Sampling I will check your work at the end of class.

12. Survey Survey – collection of factual data or opinions Population – group from which you want to gain information. Sample – part of the population you survey Random sample – members surveyed are not predetermined

13. Survey You want to know the favorite food of GMS 8 th grade students. You take a survey of the students in your math class. 1. Identify the population GMS 8 th grade students 2. Identify the sample Students in math class

14. Sampling Methods Convenience – members of the population are selected because they are available. –4 th period Math students –Students in the hall Systematic – members of the population are selected according to a pattern. –Every 5 th person walking in the hall

15. Sampling Methods Convenience? 1. Determining the favorite candidate for 8 th grade president by asking every 10 th student entering the auditorium. 2. Determining the most popular type of motorcycle by calling people listed on the 100 th page of the phone book. 3. Determining the favorite store by asking everyone who enters the mall. Convenience Not Convenient Convenience

16. Sampling Methods Systematic? 1. Sending a questionnaire to students at a track meet? 2. Sending a questionnaire to every 9 th person that enters a room? 3. Determining the favorite color by asking every 5 th person standing in the lunch line. Not Systematic Systematic

17. Sampling Methods Biased –the sample is not random because the results may not represent the whole population. Asking customers of Wal-Mart what their favorite store is Asking football players what their favorite sport is

18. Sampling Methods Biased? 1. Asking Brookshire’s customers what their favorite grocery store is? 2. Asking an 8 th grade class what their favorite sport is? 3. Asking people at Six Flags if they like amusement parks. Biased Not Biased Biased

19. You want to know the favorite sport of middle school students. You ask every 8 th person that enters the football game at GMS. 1. Identify the population Middle School students 2. Identify the sample People at GMS football game 3. Identify the sampling method. Systematic 4. Is the survey biased? Yes: Asking at a football game 5. Is the sample representative of the population? No: Other people besides middle school students may be at the football game.

20. Class Work TAKS Coach Pg. 244 – 245: 1-5 **Remember to Justify ALL Answers** TAKS Monday 4/4