Math = Language Functions = data, graphs, equations ...porterr/documents/151Group... ·...
Transcript of Math = Language Functions = data, graphs, equations ...porterr/documents/151Group... ·...
151 Groupwork Notes
Math = LanguageCalculus = study of change
Precalculus = study of functionsFunctions = data, graphs, equations
Limits....Derivatives...AntiDerivatives
Rates of Change
Average = slope between two points
Instantaneous = slope at one point=Derivative=slope of the tangent line=lim f(x+h)f(x)
h>0 h
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Limits for the definitionof derivativeepsilondelta formal definition
using algebra to find limits
using a graph or calculator to find limits
one sided limits, two sided limits
limits at infinity = end behavior
DerivativesFrom the definitionQuick and Dirty RulesPower QuotientProduct Chain
Transcendentals= Trig, logs, exponents,hyper
Second Derivative=Acceleration or Deceleration
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Definitions
Epsilon Delta of Limits
Derivative
Continuity
Therorems
Intermediate Value Theorem from ContinuitySqueeze certain limits /with sine
Mean Value Theorem two rates equal
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Skill work vs. Group Work
On Connect®Final Exam from tests
Tests from Quizzes
Quizzes from Homework
If its not on a quiz,
its not on a test.
Help on videos
On Blackboard®Work with real data
Apply to real life
work with ugly numbers
work with Technology
Opportunity to Speak math
Collaborate
Groupwork and ProjectJoin Group
Divide Tasks
Discuss work to post
151 Groupwork Notes
Posting GroupworkLeader creates thread
Writer writes math
Speaker writes English
8 topics for individual project
Before Starting:
Give your data some life by assigning units
x= cents y = cups of lemonade sold
writer: r(25)=12
speaker: According to data, a price of 25 cents sells 12 cups of lemonade
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Rates of Change Average and Instantaneous Need a regression equation in y1
Need two endpoints a=__ and b=__
and an inner point c=___
Vave= ( y1(b) y1(a) ) / ba
Vinstantaneous= y1' (c) = nderiv(y1,x,c)
according to the __ regression, between
values x= a and x=b, the average rate of change
Limits
According to the split regression, as we look backwards to 2014, we expect a value of 7.8million dollars
151 Groupwork Notes
according to the coninuous regression, we expect a value of 6.9 million in 2014
According to this continuous regression, as time goes on, there is no way of knowing what the value will be. But as we look back, the value drops.
151 Groupwork Notes
Derivatives of Polynomials and Trascendentals
Group Work Drivatives Objective: Make predictions from data that describes the value expected y(a), the rate at which the value is growing y'(a), and wheather or not the values are accelerating y''(a) using the calculator and properties of derivatives.
151 Groupwork Notes
Part 1: Polynomials1. Perform a cubic regression with your data
2. Place that regression into y1 and y2 on calculator
3. Edit y2 so it reflects the deriative
4. Into y3, use the derivative feature of the calculator (math 8:nderiv) to find the second derivative
5. Use the table to make a prediction at a point of interest.
1. Perform a cubic regression with your data
2. Place that regression into y1 and y2 on calculator
3. Edit y2 so it reflects the deriative
4. Into y3, use the derivative feature of the calculator (math 8:nderiv) to find the second derivative
5. Use the table to make a prediction at a point of interest.
151 Groupwork Notes
Example:
Writer:
r(x) = ax^3+bx^2+cx+d
r'(x)= 3ax^2+2bx+c
r''(x)=6ax+2b
r(poa)=50
r'(poa)=75
r''(poa)=100
Speaker:
According to the cubic regression, at one dollar we expect to sell 4.3 cups of lemonade with the rate of loss of .0007 cups per dollar and is accelerating
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Part 2: Transcendentals1. Perform a exponential or logarithmic regression with your data whichever makes more sense.
2. Place that regression into y1 and y2 on calculator
3. Edit y2 so it reflects the deriative
4. Into y3, use the derivative feature of the calculator (math 8:nderiv) to find the second derivative
5. Use the table to make a prediction at a point of interest.
1. Perform a exponential or logarithmic regression with your data whichever makes more sense.
2. Place that regression into y1 and y2 on calculator
3. Edit y2 so it reflects the deriative
4. Into y3, use the derivative feature of the calculator (math 8:nderiv) to find the second derivative
5. Use the table to make a prediction at a point of interest.
151 Groupwork Notes
Example:
Writer:
r(x) = a*b^x or a + blnx
r'(x)= a*b^x*lnb or b/x
r''(x)=6ax+2ba*b^x*(lnb)^2 or b/x^2
r(poa)=50
r'(poa)=75
r''(poa)=100
Speaker:
According to the exponential regression, if we charge one dollar for lemonade, we anticipate selling 4.6 cups, and we would be losing .05 cups of sales for every penny more we charge, and this loss is accelerating.
151 Groupwork Notes
Part 3: Sine Regression1. Determine a period for your function. If it is constantly increasing/decreasing, find the difference between your largest and smalles Xvalues and double that
2. Perform a sine regression with your data by changing the iterations to 1 and adding a period as found above. Use the command: sinreg 1,L1,L2,Period
3. Place that regression into y1 and y2 on calculator
4. Edit y2 so it reflects the deriative
5. Into y3, use the derivative feature of the calculator (math 8:nderiv) to find the second derivative
6. Use the table to make a prediction at a point of interest.
1. Determine a period for your function. If it is constantly increasing/decreasing, find the difference between your largest and smalles Xvalues and double that
2. Perform a sine regression with your data by changing the iterations to 1 and adding a period as found above. Use the command: sinreg 1,L1,L2,Period
3. Place that regression into y1 and y2 on calculator
4. Edit y2 so it reflects the deriative
5. Into y3, use the derivative feature of the calculator (math 8:nderiv) to find the second derivative
6. Use the table to make a prediction at a point of interest.
151 Groupwork Notes
Example:
Writer:
r(x) = asin(bx+c)+d
r'(x)= acos(bx+c)*b
r''(x)=asin(bx+c)*b^2
r(poa)=50
r'(poa)=75
r''(poa)=100
Speaker:
According to the sine regression with a period of 450, at 100 we expect to sell 4.77 cups of lemonade with a rate of loss of .09 cups per penny and is accelerating
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Mean Value Theroem and Newton's Method1. Find the cubic regression put in y1
2. Put the derivative of y1 into y2
3. Find the average rate of change between two values and put in y3
4. Adjust the window xmin and xmax
5. Turn off y1 and Do zoom 0: Fit
6. Calculate the intersection using Calc 5:intersect
1. Find the cubic regression put in y1
2. Put the derivative of y1 into y2
3. Find the average rate of change between two values and put in y3
4. Adjust the window xmin and xmax
5. Turn off y1 and Do zoom 0: Fit
6. Calculate the intersection using Calc 5:intersect
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writer
f(x) =ax^3+bx^2+cx+d
f'(x)=3ax^2+2bx+c
average rate between a= ___and b= ___
(f(b)f(a))/(ba) =
=f'(c) c = ___
Speaker
According to the cubic regression, the average rate
between 25 and 250 cents is best represented at the instance of 127 cents
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Newtons Method as a check
1. Let y4=y3y2
2. Guess x=7 by putting 7 sto x
3. issue the command xy4/nderiv(y4,x,x) sto x
Writer:
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Error1.Find exponential regression and put in y1
2. Determine the dx value
3. Put the derivative of y1 * dx in y2
4. Put y2/y1*100 in y3
dx = +/ .5 if xvalues change by 1
dx = +/ 5 if x values change by 10
dx = +/.05 if xvalues chage by .1
Or dx=+/ 2.5
Writer:
r(100)=4.59
error(100)=+/.1204
%error(100)=+/2.844
Speaker: According to the exponential regression,we expect to sell 4.6 cups of lemonade at a price of 1.00 with an error of .1
which represents a 2.8% error
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Analysis of Function
Area and Average Value
151 Groupwork Notes
Approximating Area and FTC