Algebra and Trigonometry (6th Edition)
Algebra and Trigonometry (6th Edition)
6th Edition
ISBN: 9780134463216
Author: Robert F. Blitzer
Publisher: PEARSON
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**Arithmetic Sequences on Educational Platform**

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### Problem Statement:

**Find the sum of the indicated number of terms of the arithmetic sequence.**

**Sequence:** 34, 29, 24, ...

**Number of terms:** \( n = 21 \)

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**Solution:**

To solve this problem, let's use the formula for the sum of the first \( n \) terms of an arithmetic sequence:
\[ S_n = \frac{n}{2} (2a + (n-1)d) \]

Where:
- \( S_n \) is the sum of the first \( n \) terms.
- \( n \) is the number of terms.
- \( a \) is the first term.
- \( d \) is the common difference between the terms.

Given:
- \( a = 34 \)
- \( d = 29 - 34 = -5 \)
- \( n = 21 \)

Now let's substitute these values into the formula:
\[ S_{21} = \frac{21}{2} [2(34) + (21 - 1)(-5)] \]
\[ S_{21} = \frac{21}{2} [68 + 20(-5)] \]
\[ S_{21} = \frac{21}{2} [68 - 100] \]
\[ S_{21} = \frac{21}{2} [-32] \]
\[ S_{21} = 21 \times -16 \]
\[ S_{21} = -336 \]

So, the sum of the first 21 terms of the arithmetic sequence is **-336**.

### Graphical Representation:

The provided image does not include any graphs or diagrams, and hence, no graphical representation accompanies this problem on the educational platform.
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Transcribed Image Text:**Arithmetic Sequences on Educational Platform** --- ### Problem Statement: **Find the sum of the indicated number of terms of the arithmetic sequence.** **Sequence:** 34, 29, 24, ... **Number of terms:** \( n = 21 \) --- **Solution:** To solve this problem, let's use the formula for the sum of the first \( n \) terms of an arithmetic sequence: \[ S_n = \frac{n}{2} (2a + (n-1)d) \] Where: - \( S_n \) is the sum of the first \( n \) terms. - \( n \) is the number of terms. - \( a \) is the first term. - \( d \) is the common difference between the terms. Given: - \( a = 34 \) - \( d = 29 - 34 = -5 \) - \( n = 21 \) Now let's substitute these values into the formula: \[ S_{21} = \frac{21}{2} [2(34) + (21 - 1)(-5)] \] \[ S_{21} = \frac{21}{2} [68 + 20(-5)] \] \[ S_{21} = \frac{21}{2} [68 - 100] \] \[ S_{21} = \frac{21}{2} [-32] \] \[ S_{21} = 21 \times -16 \] \[ S_{21} = -336 \] So, the sum of the first 21 terms of the arithmetic sequence is **-336**. ### Graphical Representation: The provided image does not include any graphs or diagrams, and hence, no graphical representation accompanies this problem on the educational platform.
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