Question
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Part \( B \) Which of the following expressions can be used to lind the nith term in the patterm? A. \( 3(n-1) \) B. \( 3+5(n-1) \) C. \( 3+(n-1)+5 \) D. \( 3(n-1)+5 \)

Ask by Bryant Barker. in the United States
Jan 23,2025

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Answer

The correct expression to find the \( n \)-th term is \( 3 + 5(n-1) \).

Solution

To find the \( n \)-th term of a pattern, we need to analyze the given expressions and determine which one correctly represents the \( n \)-th term. Let's break down each option: A. \( 3(n-1) \) This expression suggests that the \( n \)-th term is a multiple of 3, but it does not account for a starting value or an increment. B. \( 3 + 5(n-1) \) This expression starts with 3 and adds increments of 5 for each term after the first. This is a common form for an arithmetic sequence. C. \( 3 + (n-1) + 5 \) This expression simplifies to \( 3 + 5 + (n-1) = 8 + (n-1) \), which does not clearly represent a consistent pattern. D. \( 3(n-1) + 5 \) This expression suggests that the \( n \)-th term starts with 5 and adds multiples of 3 for each term after the first. Now, let's analyze the expressions that are likely to represent an arithmetic sequence, which typically has the form \( a + (n-1)d \), where \( a \) is the first term and \( d \) is the common difference. From the analysis, option B \( 3 + 5(n-1) \) fits the form of an arithmetic sequence, where: - The first term \( a = 3 \) - The common difference \( d = 5 \) Thus, the correct expression to find the \( n \)-th term in the pattern is: **B. \( 3 + 5(n-1) \)**

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Beyond the Answer

To find the n-th term of a sequence, we often rely on the formula that encapsulates the pattern governing the sequence. In this case, we can observe that the first term is 3, and it appears that there's a common difference, suggesting we might have an arithmetic sequence. Formulating expressions like \(3 + 5(n-1)\) can be particularly useful when working with sequences, as it captures both the initial term and the accumulated difference. When approaching these options, keep an eye out for the structure of arithmetic sequences. The expression typically takes the form of the first term plus the common difference multiplied by \((n-1)\). Therefore, while methods may vary slightly, ensuring proper sequencing and maintaining systematic order can lead to the correct expression for the n-th term!

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