This document is from a class on relative error and contains instructions, examples, and questions about determining relative error in density experiments. It begins with warm-up questions factoring expressions and solving inequalities. It then provides the definition of density and examples of calculating volume. Students are instructed to conduct and record data from a density experiment. Follow-up questions ask about the success of the experiment and potential sources of error. Extra examples calculate relative error given actual and measured densities of samples. The document concludes with a reference to homework assignments.

1. Day 13 Relative Error.notebook February 27, 2013
AIM: Relative Error
Do Now
1.) Factor the following expressions.
a.) 9x - 36 4 14
b.) x -
5 5
2.) Solve the following inequality. Graph
the solution set.
-3x + 9 < -12
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2. Day 13 Relative Error.notebook February 27, 2013
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3. Day 13 Relative Error.notebook February 27, 2013
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4. Day 13 Relative Error.notebook February 27, 2013
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5. Day 13 Relative Error.notebook February 27, 2013
Anticipatory Set
Answer the following questions.
1.) What is density?
2.) How do you find density?
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6. Day 13 Relative Error.notebook February 27, 2013
Find the volume of the following
rectangular prisms.
1.) 3 cm
2 cm
4 cm
2.)
3.6 cm
0.7 cm
1.1 cm
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7. Day 13 Relative Error.notebook February 27, 2013
Finding Density Experiment
Record your data below:
1.) Mass of the object:
2.) Length:
3.) Width:
3.) Height:
4.) Volume:
5.) Density:
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8. Day 13 Relative Error.notebook February 27, 2013
Anticipatory Set 2
1.) How do you know if your experiment was successful?
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9. Day 13 Relative Error.notebook February 27, 2013
The actual density of aluminum is 2.7 g/cm3
Use the formula below to find the relative
error of your experiment.
measured - actual
Relative Error = 100
actual
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10. Day 13 Relative Error.notebook February 27, 2013
Follow Up Questions
1.) How successful was your experiment? Justify your
answer.
2.) What do you think caused any error that you had?
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11. Day 13 Relative Error.notebook February 27, 2013
Extra Examples
1.) The density of iron is 7.9 g/cm3. In an experiment I
found the mass of my sample to be 118 grams and the
volume to be 14 cm3. What the density based on my
experiment and what is the relative error of my answer?
2.) The density of is 8.9g/cm3. In an experiment I found the
mass of my sample to be 850 grams and the volume to be
100 cm3. What the density based on my experiment and
what is the relative error of my answer?
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12. Day 13 Relative Error.notebook February 27, 2013
Homework
Homework Sheet
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