Unit 6 homework 9 geometric sequences answer key

Unit 4 – Linear Functions and Arithmetic Sequences. This unit is all about understanding linear functions and using them to model real world scenarios. Fluency in interpreting the parameters of linear functions is emphasized as well as setting up linear functions to model a variety of situations. Linear inequalities are also taught.

Unit 7: Transformations. Unit 8: Angle Relationships. Unit 9: Pythagorean Theorem. ... The chapter 3 resource geometry unit 10 test circles answer key + my pdf apr 19, 2021geometry unit 10 test circles answer key. Unit 10 Circles Homework 4 Inscribed Angles Answer Key Gina Arcs In Circles Lesson from xil.bersenggama8861.pw Distance around a ...Table of Contents for Common Core Algebra II. Unit 1 - Algebraic Essentials Review. Unit 2 - Functions as the Cornerstones of Algebra II. Unit 3 - Linear Functions, Equations, and Their Algebra. Unit 4 - Exponential and Logarithmic Functions. Unit 5 - Sequences and Series. 1. A ball is dropped from a height of 500 meters. The bble ... 2. Unit 6 Modeling Geometry 3. Grade 6 Geometry Worksheet 4. NAME GEOMETRY UNIT 3 NOTE PACKET SIMILAR TRIANGLES 5. Georgia Standards of Excellence Curriculum Frameworks ... 6. Unit 6 Grade 7 Geometry 7. 6 Exponential Functions and Sequences 8. Geometric Sequences Date PeriodGeometric Sequences (AU6 - Lesson 2 notes - geo seq.docx) AU6L#2 Video. Write explicit and recursive formulas for exponential . AU6 - 2 notes answers.pdf. Lesson 4. ... AU6 - End of Unit Homework answers.pdf . Pop Notebook Review Quiz . Algebra To Go pages: 51-52, 61-62, 64-65, 112. Ready Book Lessons: 1, 4, 5.10. Find the next three terms in the sequence. 15/2,17/2,19/2 11. Find an equation that defines the a k term of the sequence.?? =7/2+(? −1) ⋅ 1 12. Find the 314 th term of the sequence. 633/2 13. Find an equation that defines the a k term for the sequence 4, 11, 30, 67,…?? =?^ 3+3 14. Explain the connections between arithmetic sequences and linear …Common Core Algebra I.Unit #6.Lesson #9.Geometric Sequences. In this lesson, students review the basic concept of an arithmetic sequence before then extending these ideas to …2. 3. , −2, 6,... A. Suppose a term of a geometric sequence is a4 = 121.5 and the common ratio is 3. Write the formula for this sequence in the form an = a1 ⋅ rn−1. Explain how you arrived at your answer. First I substituted 121.5 for an, 4 for n, and 3 for r in the general form. Then I solved to find a1 = 4.5. Oct 6, 2021 · Figure 9.1.1: Leonardo Fibonacci (1170–1250) Fibonacci numbers appear in applications ranging from art to computer science and biology. The beauty of this sequence can be visualized by constructing a Fibonacci spiral. Consider a tiling of squares where each side has a length that matches each Fibonacci number: Figure 9.1.2

Vertex form. Graphing quadratic inequalities. Factoring quadratic expressions. Solving quadratic equations w/ square roots. Solving quadratic equations by factoring. Completing the square. Solving equations by completing the square. Solving equations with the quadratic formula. The discriminant.13. Yes, each point moves 6 units to the right and three units down. 14. No. 15. No. Though distances and angles are preserved, the lines that connect corresponding points are not ... Chapter 2 – Rigid Transformations Answer Key CK-12 Geometry Honors Concepts 9 2.7 Rotations Answers 1. 120° counterclockwise rotation about point O or 240 ...This picture illustrates Unit 10 sequences and series homework 3 geometric sequences answers. Information technology consists of A countable number of terms. Arithmetic sequences and series worksheet answers rpdp. Unit 10 - sequences & serial parametrics. When the footing of a succession are added, we get a series.All Things Algebra ® curriculum resources are rigorous, engaging, and provide both support and challenge for learners at all levels. Gina Wilson, the writer behind All Things Algebra ® is very passionate about bringing you the best. Visit the shop to learn more about each curriculum and why so many teachers choose All Things Algebra ®. The sum, S n, of the first n terms of a geometric sequence is written as S n = a 1 + a 2 + a 3 + ... + a n. We can write this sum by starting with the first term, a 1, and keep multiplying by r to get the next term as: S n = a 1 + a 1 r + a 1 r 2 + ... + a 1 r n − 1. Let’s also multiply both sides of the equation by r.Big Ideas Math Geometry Answers; Here, we have provided different Grades Solutions to Big Ideas Math Common Core 2019. ... Where can find the Big Ideas Math Textbook Answer Key for Grade K-12? The website called CCSSMathAnswers.com provides Big Ideas Math Textbook Answer Key for Grade K-12 in pdf format without …Definition 12.4.4. An infinite geometric series is an infinite sum whose first term is a1 and common ratio is r and is written. a1 +a1r +a1r2 + … +a1rn−1 + …. We know how to find the sum of the first n terms of a geometric series using the …

Unit 6 – Exponential Algebra and Functions. Lesson 1. Exponential Increase and Decrease. LESSON/HOMEWORK. LECCIÓN/TAREA. LESSON VIDEO. ANSWER …Geometric Sequences as Exponential Functions ... 9. Write an equation for the nth term of the geometric sequence 896, –448, 224, … . Algebra In this lesson we learn about geometric sequences, both explicitly and recursively defined. We connect these to exponential functions. Remove Ads Embeddable Player Middle School > Math > Algebra Exercises to Accompany "Solving Qua... Solving Logarithmic Equations Part ... Multiplying and Dividing Rational E... Algebra 2 PAP 6th PeriodClearMath Solutions. We believe every student can be a math person. Made for a diverse range of thinkers, ClearMath takes a dynamic approach to helping students build math skills, confidence, and excitement. Math Elementary School (K-5) Core. Elementary Math Solution (K-5) Math Middle School (6-8) Core. Middle School Math Solution (6-8)9 9 , 6 6 , 4 4. This is a geometric sequence since there is a common ratio between each term. In this case, multiplying the previous term in the sequence by 2 3 2 3 gives the next …

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Arithmetic & Geometric Sequences Crossword Puzzle Activity Worksheet. by. Amazing Mathematics. 168. $1.50. PDF. Google Apps™. Printable PDF & Google versions are included in this distance learning ready activity which consists of 31 Arithmetic & Geometric Sequences. Students are given the first 3 terms of a sequence.Indicate if the sequence is arithmetic or geometric by circling the correct answer. ... Aligned Ready, Set, Go Homework: Sequences 1.8. Common ratio 3. Function C.5 – 6 weeks Block 15 - 18 days Unit 6: Circles In this unit, students will examine and apply theorems involving angle relationships, find arc lengths, and find the area of sectors of circles. Students will graph and write equations of circles. Students will extend their understanding of arc length in circles and begin exploringDownload Common Core Algebra 2 Unit 6 Lesson 9 Homework Answers: FileName Speed Downloads Common Core Algebra 2 Unit 6 Lesson 9 Homework Answers [Most popular] 567 kb/s 9088 Common Core Algebra 2 Unit 6 Lesson 9 Homework Answers | added by users 5687 kb/s 8901 Common Core Algebra 2 Unit 6 Lesson 9 Homework Answers | checked 849 kb/s 7833Introduction to Sequences, Probability and Counting Theory; 9.1 Sequences and Their Notations; 9.2 Arithmetic Sequences; 9.3 Geometric Sequences; 9.4 Series and Their Notations; 9.5 Counting Principles; 9.6 Binomial Theorem; 9.7 ProbabilityThe curriculum is divided into the following units: Unit 1 – Geometry Basics. Unit 2 – Logic and Proof. Unit 3 – Parallel and Perpendicular Lines. Unit 4 – Congruent Triangles. Unit 5 – Relationships in Triangles. Unit 6 – Similar Triangles. Unit 7 – Quadrilaterals. Unit 8 – Right Triangles and Trigonometry.

Two common types of mathematical sequences are arithmetic sequences and geometric sequences. An arithmetic sequence has a constant difference between each consecutive pair of terms. This is similar to the linear functions that have the form y = mx + b. y = m x + b. A geometric sequence has a constant ratio between each pair of consecutive terms.Table of Contents for Common Core Geometry. Unit 1 - Essential Geometric Tools and Concepts. Unit 2 - Transformations, Rigid Motions, and Congruence. Unit 3 - Euclidean Triangle Proof. Unit 4 - Constructions. Unit 5 - The Tools of Coordinate Geometry. Unit 6 - Quadrilaterals. Unit 7 - Dilations and Similarity. Unit 8 - Right Triangle Trigonometry.See full list on fishtanklearning.org Use the table below to find videos, mobile apps, worksheets and lessons that supplement HMH Algebra 1. Unit 1: Unit 1A: Numbers and Expressions - Module 1: Module 1: Relationships Between Quantities. Unit 1: Unit 1A: Numbers and Expressions - Module 2: Module 2: Exponents and Real Numbers. Unit 1: Unit 1A: Numbers and Expressions - …Tues 3/31: Review of rationals warm - up (can be found on rational page). Completed Note Packet on Sequences. Corrected Blank SEQUENCE note packet (updated 4/6) HERE Answer Key to SEQUENCE Note Packet Thurs 4/2: Filled in Note Packet on Arithmetic and Geometric Series Corrected Blank SERIES Packet (updated 4/6) HERE Answer Key to SERIES Note PacketDo 4 problems. Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.Considering arithmetic and geometric sequences, would there ever be a time that a geometric sequence does not outgrow an arithmetic sequence in the long run as the number of terms in the sequences becomes really large? Explain. A geometric sequence is one in which the same number is multiplied or divided by each term to get the next term in the sequence. The number you multiply or divide by is called the common ratio, usually denoted by r. Determine if the following sequences are arithmetic, geometric or neither. 4. 1, 2, 6, 24, 120, … 5. 81, 27, 9, 3, 1, … 6.

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Algebra Unit 6 Geometric Sequences. Flashcards. Learn. Test. Match. Flashcards. Learn. Test. Match. Created by. Freda_McGuire TEACHER. ... 3 answers. QUESTION. According to graph 1, which solid's solubility is most affected by an increase in temperature? 4 answers. QUESTION. what are the 4 key symptoms of narcolepsy? 15 answers. About …Lesson 3: Geometric Sequences • Identify a geometric sequence. • Determine a recursion formula for a geometric sequence. • Determine and apply the formula for the general term of a geometric sequence. Solve problems involving geometric sequences. Lesson 5: Arithmetic Series • Define a series as the sum of the terms of a sequence.Geometry (all content) · 180 skills. Unit 1 Lines. Unit 2 Angles. Unit 3 Shapes. Unit 4 Triangles. Unit 5 Quadrilaterals. Unit 6 Coordinate plane. Unit 7 Area and perimeter. Unit 8 Volume and surface area.Algebra Unit 6. Use exponential functions to model growth. Use exponential functions to model decay. Use the equation of an exponential model to solve problems and use correlation coefficients to determine strength of association. Compare and apply different mathematical models. Algebra Unit 6. Use exponential functions to model growth. Use exponential functions to model decay. Use the equation of an exponential model to solve problems and use correlation coefficients to determine strength of association. Compare and apply different mathematical models. Mrs. Kemner's Classroom Blog - Home PageFind step-by-step solutions and answers to Algebra 1 Common Core - 9780133185485, as well as thousands of textbooks so you can move forward with confidence. Unit Transformations Student Handout 7 Answer Key. Unit Scatter Plots And Data Student Handout 4 Answer Key.. ), the development of plane geometry can proceed in the usual way if one so desires This unit focuses on a single CCSS domain that relates to basic geometric definitions and transformations in a Find the momentum of a round stone weighing 12 1955 Movies Notes: Transformations of ...APC Unit 10 - Hillgrove- Oberkofler ... Day

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Common Core Algebra I.Unit #6.Lesson #9.Geometric Sequences. In this lesson, students review the basic concept of an arithmetic sequence before then extending these ideas to geometric...Unit 11: Sequences and Series ... A3 Notes. A4 Notes. HW. HW Key. 4/10 11.2 Geometric Sequences. A3 Notes. A4 Notes ... A4 Notes. HW. HW Key. 4/22 Unit 11 Review ...The curriculum is divided into the following units: Unit 1 – Geometry Basics. Unit 2 – Logic and Proof. Unit 3 – Parallel and Perpendicular Lines. Unit 4 – Congruent Triangles. Unit 5 – Relationships in Triangles. Unit 6 – Similar Triangles. Unit 7 – Quadrilaterals. Unit 8 – Right Triangles and Trigonometry. View unit 6 homework part 1.pdf from PHYSICS N/A at Richardson H S. Name _ Period _ Algebra 3-4 Unit 6 Part 1 Exponentials 6.1 I can write arithmetic sequences using recursive and explicit ... Name _____ Period _____ Algebra 3-4 Unit 6.2 Geometric Sequences A geometric sequence is a list of numbers (or terms) with a common ratio between each ...Algebra and Trigonometry. 8th Edition • ISBN: 9781439048474 Larson. 12,654 solutions. ... Get your Geometry homework done with Quizlet! Browse through thousands of step-by-step solutions to end-of-chapter questions from the most popular Geometry textbooks. It's never been a better time to #LearnOn.Use the table below to find videos, mobile apps, worksheets and lessons that supplement HMH Algebra 1. Unit 1: Unit 1A: Numbers and Expressions - Module 1: Module 1: Relationships Between Quantities. Unit 1: Unit 1A: Numbers and Expressions - Module 2: Module 2: Exponents and Real Numbers. Unit 1: Unit 1A: Numbers and Expressions - …Oct 6, 2021 · an = a1rn − 1 GeometricSequence. In fact, any general term that is exponential in n is a geometric sequence. Example 9.3.1: Find an equation for the general term of the given geometric sequence and use it to calculate its 10th term: 3, 6, 12, 24, 48…. Solution. Begin by finding the common ratio, r = 6 3 = 2. All Things Algebra ® curriculum resources are rigorous, engaging, and provide both support and challenge for learners at all levels. Gina Wilson, the writer behind All Things Algebra ® is very passionate about bringing you the best. Visit the shop to learn more about each curriculum and why so many teachers choose All Things Algebra ®. ….

Oct 6, 2021 · Figure 9.1.1: Leonardo Fibonacci (1170–1250) Fibonacci numbers appear in applications ranging from art to computer science and biology. The beauty of this sequence can be visualized by constructing a Fibonacci spiral. Consider a tiling of squares where each side has a length that matches each Fibonacci number: Figure 9.1.2 Introduction to Sequences, Probability and Counting Theory; 9.1 Sequences and Their Notations; 9.2 Arithmetic Sequences; 9.3 Geometric Sequences; 9.4 Series and Their Notations; 9.5 Counting Principles; 9.6 Binomial Theorem; 9.7 ProbabilityGiven the explicit formula for a geometric sequence find the first five terms and the 8th term. 3) 4, 16, 36, 64, ... 5) −2, −4, −8, −16, ... 2) −1, 1, 4, 8, ... 4) −3, −15, −75, −375, ... 6) 1, −5, 25, −125, ... Given the explicit formula for a geometric sequence find the first five terms and the 8th term. 7) 13) 12) 14)Sequences • Given a sequence finding a rule for generating the sequence is not always straightforward Example: • Assume the sequence: 1,3,5,7,9, …. • What is the formula for the sequence? • Each term is obtained by adding 2 to the previous term. • 1, 1+2=3, 3+2=5, 5+2=7 • It suggests an arithmetic progression: a+nd with a=1 and d=2Displaying top 8 worksheets found for - Gina Wilsin All Things Algebra 2016 Answer Keys. Some of the worksheets for this concept are Gina wilson all things algebra 2014 answers, Gina wilson all things algebra 2014 answers unit 2, Gina wilson unit 8 quadratic equation answers pdf, A unit plan on probability statistics, Name unit 5 systems of equations inequalities bell, , Geometry unit answer ... Sep 19, 2016 · Watch Common Core Algebra I.Unit 6.Lesson 9.Geometric Sequences, Math, Middle School, Math, Algebra Videos on TeacherTube. Sum of the First n Terms of an Arithmetic Sequence. The sum, Sn, S n, of the first n terms of an arithmetic sequence is. Sn = n 2(a1 + an) S n = n 2 ( a 1 + a n) where a1 a 1 is the first term and an a n is the n th term. We apply this formula in the next example where the first few terms of the sequence are given. Unit 6 homework 9 geometric sequences answer key, geometric sequence: A geometric sequence is a sequence with a constant ratio between successive terms. Geometric sequences are also known as geometric progressions. index: The index of a term in a sequence is the term’s “place” in the sequence. Natural Numbers: The natural numbers are the counting numbers and consist of all positive ..., Geometric Sequences yes; the common ratio is 3 no; there is no common ratio ... Chapter 6 worksheet answers Author: Greg Garris Created Date: 20140129203101Z ... , 9. (a) Calculate the 100th term of the sequence given by unn=−85. (b) Calculate the 25th term of the sequence given by unn=−11 3. (c) Calculate the 200th term of the sequence given by unn=+322. (d) Calculate the 58th term of the sequence defined by unn=−1000 5 . 10. Four sequences, A, B, C and D, are defined by the following formulae: A ..., 1/8, etc. Since the sequence is infinite, the distance cannot be traveled. Remark. The steps are terms in the sequence. ˆ 1 2, 1 4, 1 8, ˙ Sequences of values of this type is the topic of this first section. Remark. The sum of the steps forms an infinite series, the topic of Section 10.2 and the rest of Chapter 10. 1 2 + 1 4 + 1 8 ..., Lesson 6 Describing Transformations; Properties of Rigid Transformations. Lesson 7 No Bending or Stretching; Lesson 8 Rotation Patterns; Lesson 9 Moves in Parallel; Lesson 10 Composing Figures; Congruence. Lesson 11 What Is the Same? Lesson 12 Congruent Polygons; Lesson 13 Congruence; Angles in a Triangle. Lesson 14 Alternate Interior Angles ..., The ratios are not constant, so the sequence is not geometric. Since the differences are constant, the sequence is arithmetic. The common difference is 3. 1, í1, 1, í1, « 62/87,21 Since the ratios are constant, the sequence is geometric. The common ratio is ±1. Find the next three terms in each geometric sequence. 10, 20, 40, 80, « 62/87,21 , Find step-by-step solutions and answers to SpringBoard Algebra 2 - 9781457301537, as well as thousands of textbooks so you can move forward with confidence. ... Geometric Sequences. Section 20.2: Geometric Series. Section 20.3: Convergence of Series. Page 319: Activity 20 Practice. ... Placing the Unit Circle on the Coordinate Plane. Section 32 ..., Advanced Geometry Distance Learning Plans. Math Topics. Assignment Calendars. ... Unit 9 Homework 2 Answer Key.pdf (101k) Brian Donaldson, Apr 24, 2018, 2:25 PM. v.1., Remote Learning: 3/16 - Solving Exponential Equations. Students: I will post more information later today. Answers to homework: 1) x = 3; 2) x = -7; 3) x = 3; 4) x = 4; 5) infinite solutions..., Geometric Sequences yes; the common ratio is 3 no; there is no common ratio ... Chapter 6 worksheet answers Author: Greg Garris Created Date: 20140129203101Z ... , Section 6.6 Geometric Sequence, p. 332 Equation for a Geometric Sequence, p. 334. Section 6.7 Recursive Equation for an Arithmetic Sequence, p. 340 Recursive Equation for a Geometric …, Displaying all worksheets related to - Unit 9 Transformations Gina Wilson. Worksheets are Unit 9 test transformations answer key, Unit 9 test study guide transformations answer key, Geometric transformations work answers, Algebra 2 work parent functions and, Dilations and transformations work, Unit 9 geometry answers key, Transformations homework packet all answerstebook, Gradpoint us history ... , Remote Learning: 3/16 - Solving Exponential Equations. Students: I will post more information later today. Answers to homework: 1) x = 3; 2) x = -7; 3) x = 3; 4) x = 4; 5) infinite solutions... , Please do not copy or share the Answer Keys or other membership content. Answer keys are for teacher use only and may not be distributed to students. Please do not post the Answer Keys or other membership content on a website for others to view. This includes school websites and teacher pages on school websites., 9 9 , 6 6 , 4 4. This is a geometric sequence since there is a common ratio between each term. In this case, multiplying the previous term in the sequence by 2 3 2 3 gives the next …, The ratios are not constant, so the sequence is not geometric. Since the differences are constant, the sequence is arithmetic. The common difference is 3. 1, í1, 1, í1, « 62/87,21 Since the ratios are constant, the sequence is geometric. The common ratio is ±1. Find the next three terms in each geometric sequence. 10, 20, 40, 80, « 62/87,21 , 5 – 6 weeks Block 15 - 18 days Unit 6: Circles In this unit, students will examine and apply theorems involving angle relationships, find arc lengths, and find the area of sectors of circles. Students will graph and write equations of circles. Students will extend their understanding of arc length in circles and begin exploring, Unit 2 Solving basic equations & inequalities (one variable, linear) Unit 3 Linear equations, functions, & graphs. Unit 4 Sequences. Unit 5 System of equations. Unit 6 Two-variable …, Tell students that the sequences they have seen today (in this activity and in the warm-up) have a special name: geometric sequences. Geometric sequences are characterized by a growth factor. In a geometric sequence if you divide any term by the previous term, you always get the same value: the growth factor for the sequence., The curriculum is divided into the following units: Unit 1 – Geometry Basics. Unit 2 – Logic and Proof. Unit 3 – Parallel and Perpendicular Lines. Unit 4 – Congruent Triangles. Unit 5 – Relationships in Triangles. Unit 6 – Similar Triangles. Unit 7 – Quadrilaterals. Unit 8 – Right Triangles and Trigonometry., Intro Common Core Algebra I.Unit #6.Lesson #9.Geometric Sequences eMATHinstruction 39.6K subscribers Subscribe 32K views 8 years ago Common Core Algebra I, Unit 6 - Exponents,..., The sum, S n, of the first n terms of a geometric sequence is written as S n = a 1 + a 2 + a 3 + ... + a n. We can write this sum by starting with the first term, a 1, and keep multiplying by r to get the next term as: S n = a 1 + a 1 r + a 1 r 2 + ... + a 1 r n − 1. Let’s also multiply both sides of the equation by r. , Advanced Geometry Distance Learning Plans. Math Topics. Assignment Calendars. ... Unit 9 Homework 2 Answer Key.pdf (101k) Brian Donaldson, Apr 24, 2018, 2:25 PM. v.1., As Congress moves to repeal the Affordable Care Act, also known as Obamacare, here are answers to three key questions for consumers. By clicking "TRY IT", I agree to receive newsletters and promotions from Money and its partners. I agree to..., Mrs. Kemner's Classroom Blog - Home Page, Advanced Math questions and answers; Unit 06-01 - Sample Quiz: Arithmetic & Geometric Sequences Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Arithmetic Sequence Consider the first six terms of this sequence: 2,5, 8, 11, 14, 17..... What would be the 41* term of this sequence? a. , However, their domains are not the same. Exponential functions are defined for all real numbers, and geometric sequences are defined only for positive integers. Another difference is that the base of a geometric sequence (the common ratio) can be negative, but the base of an exponential function must be positive., Select a Unit. Unit 1 Sequences; Unit 2 Linear and Exponential Functions; Unit 3 Features of Functions; Unit 4 Equations and Inequalities; Unit 5 Systems of Equations and Inequalities; Unit 6 Quadratic Functions; Unit 7 Structures of Quadratic Expressions; Unit 8 More Functions, More Features; Unit 9 Modeling Data, Definition 12.4.4. An infinite geometric series is an infinite sum whose first term is a1 and common ratio is r and is written. a1 +a1r +a1r2 + … +a1rn−1 + …. We know how to find the sum of the first n terms of a geometric series using the …, Definition 12.4.4. An infinite geometric series is an infinite sum whose first term is a1 and common ratio is r and is written. a1 +a1r +a1r2 + … +a1rn−1 + …. We know how to find the sum of the first n terms of a geometric series using the …, Two common types of mathematical sequences are arithmetic sequences and geometric sequences. An arithmetic sequence has a constant difference between each …, This Sequences and Series Unit Bundle includes guided notes, homework assignments, two quizzes, a study guide, and a unit test that cover the following topics: • Explicit vs. Recursive Sequences. • Writing the Explicit and Recursive Equation of a Sequence. • Arithmetic Sequences (writing formulas, finding terms, and finding arithmetic means) , 2. 3. , −2, 6,... A. Suppose a term of a geometric sequence is a4 = 121.5 and the common ratio is 3. Write the formula for this sequence in the form an = a1 ⋅ rn−1. Explain how you arrived at your answer. First I substituted 121.5 for an, 4 for n, and 3 for r in the general form. Then I solved to find a1 = 4.5.