Find the 7tn term of the geometric sequence whose common ratio is and whose first term is 4.

Algebra and Trigonometry (6th Edition)
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ChapterP: Prerequisites: Fundamental Concepts Of Algebra
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**Geometric Sequences: Finding the 7th Term**

**Problem:**
Find the 7th term of the geometric sequence whose common ratio is \(\frac{3}{2}\) and whose first term is 4.

**Solution:**
To find the nth term of a geometric sequence, use the formula:
\[ a_n = a_1 \cdot r^{(n-1)} \]
where:
- \( a_n \) is the nth term
- \( a_1 \) is the first term
- \( r \) is the common ratio
- \( n \) is the term number

Given data:
- First term (\( a_1 \)) = 4
- Common ratio (r) = \(\frac{3}{2}\)
- Term number (n) = 7

Step-by-step calculation:
1. Substitute the given values into the formula:
\[ a_7 = 4 \cdot \left(\frac{3}{2}\right)^{(7-1)} \]

2. Calculate \( \left(\frac{3}{2}\right)^{6} \):
\[ \left(\frac{3}{2}\right)^6 = \frac{3^6}{2^6} = \frac{729}{64} \]

3. Multiply by the first term:
\[ a_7 = 4 \cdot \frac{729}{64}\]

4. Simplify the multiplication:
\[ a_7 = \frac{4 \cdot 729}{64} = \frac{2916}{64} \]

5. Simplify the fraction:
\[ a_7 = 45.5625 \]

Therefore, the 7th term of the geometric sequence is 45.5625.

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Transcribed Image Text:**Geometric Sequences: Finding the 7th Term** **Problem:** Find the 7th term of the geometric sequence whose common ratio is \(\frac{3}{2}\) and whose first term is 4. **Solution:** To find the nth term of a geometric sequence, use the formula: \[ a_n = a_1 \cdot r^{(n-1)} \] where: - \( a_n \) is the nth term - \( a_1 \) is the first term - \( r \) is the common ratio - \( n \) is the term number Given data: - First term (\( a_1 \)) = 4 - Common ratio (r) = \(\frac{3}{2}\) - Term number (n) = 7 Step-by-step calculation: 1. Substitute the given values into the formula: \[ a_7 = 4 \cdot \left(\frac{3}{2}\right)^{(7-1)} \] 2. Calculate \( \left(\frac{3}{2}\right)^{6} \): \[ \left(\frac{3}{2}\right)^6 = \frac{3^6}{2^6} = \frac{729}{64} \] 3. Multiply by the first term: \[ a_7 = 4 \cdot \frac{729}{64}\] 4. Simplify the multiplication: \[ a_7 = \frac{4 \cdot 729}{64} = \frac{2916}{64} \] 5. Simplify the fraction: \[ a_7 = 45.5625 \] Therefore, the 7th term of the geometric sequence is 45.5625. --- This problem also contains a user input box for submitting answers and symbols for actions such as clearing the fields (X), resetting (circular arrow), and help (question mark) commonly found in educational software interfaces.
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