
Calculus: Early Transcendentals
8th Edition
ISBN: 9781285741550
Author: James Stewart
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
![### Problem Statement
**Part 2. Find the sum:**
\[ \sum_{k=1}^{15} (20 - 3k) \]
### Explanation
This mathematical notation represents the sum of the series defined by the expression \( 20 - 3k \) as \( k \) runs from 1 to 15. To compute this, we need to substitute each integer value of \( k \) from 1 to 15 into the expression \( 20 - 3k \) and then add up all those values.
Here's how you can break it down step-by-step:
1. Substitute \( k = 1 \) into \( 20 - 3k \).
2. Substitute \( k = 2 \) into \( 20 - 3k \).
3. Continue this process up to \( k = 15 \).
4. Sum up all the resulting values:
\[
(20 - 3 \cdot 1) + (20 - 3 \cdot 2) + (20 - 3 \cdot 3) + \ldots + (20 - 3 \cdot 15)
\]
### Series Summation
We notice that this is an arithmetic series where the first term \( a = 20 - 3 \times 1 = 17 \) and the common difference \( d = -3 \). The number of terms \( n = 15 \).
The sum \( S_n \) of an arithmetic series can be calculated using the formula:
\[
S_n = \frac{n}{2} \times (2a + (n-1)d)
\]
Substituting the values:
\[a = 17,\ d = -3,\ \text{and}\ n = 15:\]
\[
S_{15} = \frac{15}{2} \times [2 \times 17 + (15 - 1) \times (-3)]
\]
Solving inside the brackets first:
\[
2 \times 17 = 34
\]
\[
(15 - 1) \times (-3) = 14 \times (-3) = -42
\]
Then:
\[
34 + (-42) = -8
\]
Now, apply the summation formula:
\[
S_{15} = \frac{15}{2} \times (-8)
\]
\](https://content.bartleby.com/qna-images/question/159ba596-6a8b-4dd1-b047-54789f82ea1f/76bd7ddb-b7da-4ede-b6a5-1e016e308830/jhr1ntb_thumbnail.jpeg)
Transcribed Image Text:### Problem Statement
**Part 2. Find the sum:**
\[ \sum_{k=1}^{15} (20 - 3k) \]
### Explanation
This mathematical notation represents the sum of the series defined by the expression \( 20 - 3k \) as \( k \) runs from 1 to 15. To compute this, we need to substitute each integer value of \( k \) from 1 to 15 into the expression \( 20 - 3k \) and then add up all those values.
Here's how you can break it down step-by-step:
1. Substitute \( k = 1 \) into \( 20 - 3k \).
2. Substitute \( k = 2 \) into \( 20 - 3k \).
3. Continue this process up to \( k = 15 \).
4. Sum up all the resulting values:
\[
(20 - 3 \cdot 1) + (20 - 3 \cdot 2) + (20 - 3 \cdot 3) + \ldots + (20 - 3 \cdot 15)
\]
### Series Summation
We notice that this is an arithmetic series where the first term \( a = 20 - 3 \times 1 = 17 \) and the common difference \( d = -3 \). The number of terms \( n = 15 \).
The sum \( S_n \) of an arithmetic series can be calculated using the formula:
\[
S_n = \frac{n}{2} \times (2a + (n-1)d)
\]
Substituting the values:
\[a = 17,\ d = -3,\ \text{and}\ n = 15:\]
\[
S_{15} = \frac{15}{2} \times [2 \times 17 + (15 - 1) \times (-3)]
\]
Solving inside the brackets first:
\[
2 \times 17 = 34
\]
\[
(15 - 1) \times (-3) = 14 \times (-3) = -42
\]
Then:
\[
34 + (-42) = -8
\]
Now, apply the summation formula:
\[
S_{15} = \frac{15}{2} \times (-8)
\]
\
Expert Solution

This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by stepSolved in 2 steps with 2 images

Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, calculus and related others by exploring similar questions and additional content below.Similar questions
- 4- Calculate the following sums: 3 Σ b- k +1 k=0 1,arrow_forwardWhich of the following is the correct expression for the sum below? 6. 2 3(3)* k=1 Select the correct answer below: O 27 + 81 + ... + 729 O 9 + 27 + ... + 6561 O 27 + 81 + ... + 2187 O 9 + 27 + ... + 2187 O 9 + 27 + ... + 729 O 3+9+ ... + 2187arrow_forward6.3.7arrow_forward
- 4.) Find the sum: L X - 2002 1992 +1982 - 1972 + 196²-1952 +...+ 2² — 1. - 37 Fibonacci's problem: "The Lion the Iconard the Leonard and the Bear"arrow_forwardWhat is the correct answer to the following summation: 20 Σ (21) i=10 Recall the formula: n Σ1 = n·(n+1)/2 i=1 Select one: O a. 420-90 O b. O c. 40-41/2 O d. 20-11/2 420/2-90/2arrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
- Calculus: Early TranscendentalsCalculusISBN:9781285741550Author:James StewartPublisher:Cengage LearningThomas' Calculus (14th Edition)CalculusISBN:9780134438986Author:Joel R. Hass, Christopher E. Heil, Maurice D. WeirPublisher:PEARSONCalculus: Early Transcendentals (3rd Edition)CalculusISBN:9780134763644Author:William L. Briggs, Lyle Cochran, Bernard Gillett, Eric SchulzPublisher:PEARSON
- Calculus: Early TranscendentalsCalculusISBN:9781319050740Author:Jon Rogawski, Colin Adams, Robert FranzosaPublisher:W. H. FreemanCalculus: Early Transcendental FunctionsCalculusISBN:9781337552516Author:Ron Larson, Bruce H. EdwardsPublisher:Cengage Learning

Calculus: Early Transcendentals
Calculus
ISBN:9781285741550
Author:James Stewart
Publisher:Cengage Learning

Thomas' Calculus (14th Edition)
Calculus
ISBN:9780134438986
Author:Joel R. Hass, Christopher E. Heil, Maurice D. Weir
Publisher:PEARSON

Calculus: Early Transcendentals (3rd Edition)
Calculus
ISBN:9780134763644
Author:William L. Briggs, Lyle Cochran, Bernard Gillett, Eric Schulz
Publisher:PEARSON

Calculus: Early Transcendentals
Calculus
ISBN:9781319050740
Author:Jon Rogawski, Colin Adams, Robert Franzosa
Publisher:W. H. Freeman


Calculus: Early Transcendental Functions
Calculus
ISBN:9781337552516
Author:Ron Larson, Bruce H. Edwards
Publisher:Cengage Learning