Lesson 11: Linear and Exponential Investigations
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- Prudence Copeland
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![Recall: Linear y = mx + b Exponential y = a b x Investigation : Matchstick Houses [adapted from http://www.transum.org/maths/activity/matchstick_patterns/] A.](/docs-images/85/92438008/images/1-1.jpg "Determine the number of matchsticks in each house and record your information in the table below. Then sketch a picture of the fourth term house.")
1 Hart Interactive Algebra Lesson Lesson : Linear and Exponential Investigations Opening Exercise In this lesson, you ll be exploring linear and exponential function in five different investigations. You will decide if the investigation is designed to show linear or exponential growth or decay, write an equation to model the situation and explain your thinking. Recall: Linear y = mx + b Exponential y = a b x Investigation : Matchstick Houses [adapted from A. Determine the number of matchsticks in each house and record your information in the table below. Then sketch a picture of the fourth term house. Picture of Matchstick House Term Number Number of Matchsticks 6 B. Is this linear or exponential? Decay or growth? C. Write a formula to determine the number of matchsticks needed for term t. Lesson : Linear and Exponential Investigations Unit 6: Exponential Functions & Their Applications S.25 This work is derived from Eureka Math and licensed by Great Minds. 205 Great Minds. eureka-math.org This file derived from ALG I--TE
2 Hart Interactive Algebra Lesson Investigation 2: Eliminating Sixes You will need: access to a computer Directions: Go to the website Use the pull down menu to select 60 dice to roll and then select. Count the number of dice that show a and record it in the table on the next page. Then subtract the number of sixes to get the new number of dice to roll. Use the button to select a new number of dice to roll. Continue to count the number of sixes, subtract those from the number of dice and reroll with the new number of dice. Continue rolling the dice until you have 2 dice left or you have completed 25 trials. Graph the number of dice for each roll in the grid provided on the next page, then answer the questions below. Reflection: A. About what fraction of the original amount of dice are left after the first roll? B. Is this linear or exponential? Decay or growth? C. Write a formula to model the number of dice left after r rolls. D. What is the domain for this situation? What is the range? Lesson : Linear and Exponential Investigations Unit 6: Exponential Functions & Their Applications S.26 This work is derived from Eureka Math and licensed by Great Minds. 205 Great Minds. eureka-math.org This file derived from ALG I--TE
3 Lesson Hart Interactive Algebra Investigation 2: Eliminating Sixes continued Dice Roll (trial number) Number of Dice to Roll 0 60 Number of Sixes (subtract from Number of Dice to Roll for next trial) Lesson : Unit 6: Linear and Exponential Investigations Exponential Functions & Their Applications This work is derived from Eureka Math and licensed by Great Minds. 205 Great Minds. eureka-math.org This file derived from ALG I--TE S.27
4 Hart Interactive Algebra Lesson You will need: one length of masking tape, scissors Directions: Investigation 3: A Sticky Situation Cut one piece of masking tape to match the outline shown on the next page. Place it over the outlined tape (Tape 0). Cut another piece of masking tape that is three times as long as the first piece. Place it next to the first piece of tape. Cut another piece of tape that is three times as long as the second piece of tape. Place it next to the second piece of tape. Continue doing this until you run out of tape or the tape strip will no longer fit on your paper. Organizing Your Work: A. Write the length you expected to have at each step. Tape Number Expected Length of Each Piece of Tape (centimeters) Actual Length of Each Piece of Tape (centimeters) 0.5 You will need: a ruler Measuring: B. Measure each piece of tape to the nearest tenth of a centimeter and record those lengths in the table. Why might there be differences between the expected and actual measurements? C. Is this linear or exponential? Decay or growth? D. Write a formula to determine the expected length of tape at each tape number. E. What is the domain for this situation? What is the range? Lesson : Linear and Exponential Investigations Unit 6: Exponential Functions & Their Applications S.28 This work is derived from Eureka Math and licensed by Great Minds. 205 Great Minds. eureka-math.org This file derived from ALG I--TE
5 Hart Interactive Algebra Lesson Investigation 3: A Sticky Situation continued Tape 0 Tape Tape 2 Tape 3 Tape 4 Tape 5 Tape 6 Lesson : Linear and Exponential Investigations Unit 6: Exponential Functions & Their Applications S.29 This work is derived from Eureka Math and licensed by Great Minds. 205 Great Minds. eureka-math.org This file derived from ALG I--TE
6 Hart Interactive Algebra Lesson Investigation 4: Bisecting a Triangle You will need: a ruler A. Measure the length of each side of the triangle below in inches. Round to the nearest inch. Record all data in the table. Lesson : Linear and Exponential Investigations Unit 6: Exponential Functions & Their Applications S.30 This work is derived from Eureka Math and licensed by Great Minds. 205 Great Minds. eureka-math.org This file derived from ALG I--TE
7 Hart Interactive Algebra Lesson B. Mark on each side of the triangle the exact middle of the side. This point is the midpoint and you are bisecting each side. C. Connect two of the midpoints. Now connect another two midpoints and then the last set of midpoints. Every midpoint should be connected to the other two midpoints. D. Repeat Steps A, B and C. E. Repeat Steps A, B and C. Term Number Length of each side of the triangle in. F. Write a formula to determine the length of the triangles sides for term t. G. This was an example of exponential decay. How could this activity be changed to show exponential growth? Lesson : Linear and Exponential Investigations Unit 6: Exponential Functions & Their Applications S.3 This work is derived from Eureka Math and licensed by Great Minds. 205 Great Minds. eureka-math.org This file derived from ALG I--TE
8 Hart Interactive Algebra Lesson Investigation 5: Triangle Patterns A. Determine the number of triangles in each term and record your information in the table below. Then sketch a picture of the fourth term triangle drawing. Triangle Drawing Term Number Number of Triangles 5 B. Is this linear or exponential situation? Decay or growth? C. Write a formula to determine the number of triangles needed for term t. D. What is the domain of this sequence? What is the range? E. Draw a new sequence of shapes that fits the sequence shown in the last row of the table below. Drawing Term Number Number of Lesson : Linear and Exponential Investigations Unit 6: Exponential Functions & Their Applications S.32 This work is derived from Eureka Math and licensed by Great Minds. 205 Great Minds. eureka-math.org This file derived from ALG I--TE
9 Hart Interactive Algebra Lesson Lesson Summary For each grid below, sketch a graph that shows the two characteristics. The first one for Linear Growth has been done for you. Growth Decay Exponential Linear Lesson : Linear and Exponential Investigations Unit 6: Exponential Functions & Their Applications S.33 This work is derived from Eureka Math and licensed by Great Minds. 205 Great Minds. eureka-math.org This file derived from ALG I--TE
10 Hart Interactive Algebra Lesson Homework Problem Set For each table in Problems 6, graph the data then classify the data as describing a linear relationship, an exponential growth relationship, an exponential decay relationship, or neither. If the relationship is linear or exponential, write a formula that models the data.. xx ff(xx) Linear or Exponential or Neither? Growth or Decay? Equation if linear or exponential: Lesson : Linear and Exponential Investigations Unit 6: Exponential Functions & Their Applications S.34 This work is derived from Eureka Math and licensed by Great Minds. 205 Great Minds. eureka-math.org This file derived from ALG I--TE
11 Hart Interactive Algebra Lesson 2. xx ff(xx) Linear or Exponential or Neither? Growth or Decay? Equation if linear or exponential: 3. xx ff(xx) Linear or Exponential or Neither? Growth or Decay? Equation if linear or exponential: Lesson : Linear and Exponential Investigations Unit 6: Exponential Functions & Their Applications S.35 This work is derived from Eureka Math and licensed by Great Minds. 205 Great Minds. eureka-math.org This file derived from ALG I--TE
12 Hart Interactive Algebra Lesson 4. xx ff(xx) Linear or Exponential or Neither? Growth or Decay? Equation if linear or exponential: 5. xx ff(xx) Linear or Exponential or Neither? Growth or Decay? Equation if linear or exponential: Lesson : Linear and Exponential Investigations Unit 6: Exponential Functions & Their Applications S.36 This work is derived from Eureka Math and licensed by Great Minds. 205 Great Minds. eureka-math.org This file derived from ALG I--TE
13 Hart Interactive Algebra Lesson 6. xx ff(xx) Linear or Exponential or Neither? Growth or Decay? Equation if linear or exponential: Spiral Review Function Notation & Evaluating Functions Determine the value of each of the following given, f(x) = -x f(0) 8. f(4) 9. f(- 4) 0. f(2). f(- 2) 2. f 2 Lesson : Linear and Exponential Investigations Unit 6: Exponential Functions & Their Applications S.37 This work is derived from Eureka Math and licensed by Great Minds. 205 Great Minds. eureka-math.org This file derived from ALG I--TE
14 Hart Interactive Algebra Lesson Spiral Review Domain and Range For each of the following state the domain and range in interval notation if possible. 3. f(x) = -2x + 4. f(x) = 2 x 5. fx () = x Domain: Domain: Domain: Range: Range: Range: Domain: Domain: Domain: Range: Range: Range: 9. {(, 3), (-4, 9), (-2, -7)} Domain: Domain: Domain: Range: Range: Range: Lesson : Linear and Exponential Investigations Unit 6: Exponential Functions & Their Applications S.38 This work is derived from Eureka Math and licensed by Great Minds. 205 Great Minds. eureka-math.org This file derived from ALG I--TE
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