Bell Ringer3-28-11

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

11

4

12

3

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?

2

11

4

12

3

11

3

4

4

9

2

33

11

4

12

2

11

12

61

12

16

12

27

12

18

cups4

115

12

183

1

3

12

61

12

61

12

16

12

27

12

18 cups

6

110

12

122

1

2

12

61

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?

4.902,24ponentPositiveEx:1

10&1:1 BetweenstFactor

miles410 2.49024

Quiz3-28-11

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 + 1B. y = 4.5xC. y = x + 4.5D. y = x + 3.5

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/studentPlant tray = $3.50/studentx = # studentsy = Total money needed

50.4$5.31$: tEachStuden

EquationB

studentsTotal )(#5.4

students) (totalcost Student

:Cost Total

Speed Test1. 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.

Problem of the Week

#5-31. 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.

Reach for the StarsMonday

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 inB. 24 inC. 84 inD. 59 in

Reach for the StarsMonday

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. $5.75B. $6.50C. $7.25D. $8.00

Reach for the StarsMonday

Which table best represents the equationshown below?

y = 2x + 3

Class Work: Sampling

You need your notes. Title the notes: Sampling

I will check your work at the end of class.

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

Survey

You want to know the favorite food of GMS 8th grade students. You take a survey of the students in your math class.

1. Identify the populationGMS 8th grade students

2. Identify the sampleStudents in math class

Sampling Methods

•Convenience – members of the population are selected because they are available.–4th period Math students–Students in the hall

•Systematic – members of the population are selected according to a pattern.–Every 5th person walking in the hall

Sampling MethodsConvenience? 1. Determining the favorite candidate

for 8th grade president by asking every 10th student entering the auditorium.

2. Determining the most popular type of

motorcycle by calling people listed on the 100th page of the phone book.

3. Determining the favorite store by asking everyone who enters the mall.

Convenience

Not Convenient

Convenience

Sampling MethodsSystematic?1. Sending a questionnaire to

students at a track meet?

2. Sending a questionnaire to every 9th person that enters a room?

3. Determining the favorite color by asking every 5th person standing in the lunch line.

Not Systematic

Systematic

Systematic

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

Sampling Methods

Biased? 1. Asking Brookshire’s customers

what their favorite grocery store is?

2. Asking an 8th grade class what their favorite sport is?

3. Asking people at Six Flags if they like amusement parks.

Biased

Not Biased

Biased

You want to know the favorite sport of middle school students. You ask every 8th person that enters the football game at GMS.

1. Identify the populationMiddle School students

2. Identify the samplePeople 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.

Class Work

TAKS Coach Pg. 244 – 245: 1-5**Remember to Justify ALL Answers**

TAKS Monday4/4