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Application
Answer the following:

4. The next three terms of the arithmetic sequence [tex]\(\frac{1}{2}, 1, \frac{3}{2}, 2, \ldots\)[/tex] are [tex]\(2 \frac{1}{2}, 3, 3 \frac{1}{2}\)[/tex]. Do you agree? Explain.


Sagot :

Let's analyze the given arithmetic sequence: [tex]\(\frac{1}{2}, 1, \frac{3}{2}, 2, \ldots\)[/tex].

### Step-by-Step Solution:

1. Identify the First Four Terms:
The first four terms of the sequence are:
[tex]\(\frac{1}{2}, 1, \frac{3}{2}, 2\)[/tex].

2. Determine the Common Difference:
In an arithmetic sequence, the common difference ([tex]\(d\)[/tex]) is found by subtracting any term from the term that follows it. Let's find the common difference using the first and second terms:
[tex]\[ d = 1 - \frac{1}{2} = \frac{1}{2} \][/tex]
We can verify this common difference using other consecutive terms as well:
[tex]\[ \frac{3}{2} - 1 = \frac{1}{2} \][/tex]
[tex]\[ 2 - \frac{3}{2} = \frac{1}{2} \][/tex]

3. Use the Common Difference to Find the Next Three Terms:
To find the next term after [tex]\(2\)[/tex], we add the common difference [tex]\(\frac{1}{2}\)[/tex] to [tex]\(2\)[/tex]:
[tex]\[ \text{Next term} = 2 + \frac{1}{2} = 2\frac{1}{2} \quad \text{(or 2.5)} \][/tex]
Now, to find the term after [tex]\(2\frac{1}{2}\)[/tex], we add the common difference [tex]\(\frac{1}{2}\)[/tex]:
[tex]\[ \text{Next term} = 2\frac{1}{2} + \frac{1}{2} = 3 \][/tex]
Finally, to find the term after [tex]\(3\)[/tex], we again add the common difference [tex]\(\frac{1}{2}\)[/tex]:
[tex]\[ \text{Next term} = 3 + \frac{1}{2} = 3\frac{1}{2} \quad \text{(or 3.5)} \][/tex]

4. Conclusion:
The next three terms of the arithmetic sequence [tex]\(\frac{1}{2}, 1, \frac{3}{2}, 2, \ldots\)[/tex] are indeed [tex]\(2\frac{1}{2}, 3, 3\frac{1}{2} \)[/tex]. Therefore, I agree with the given statement.

Thus, the given next three terms are correct.