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Find the \( 56^{\text {th }} \) term of the following arithmetic sequence. \[ 4,11,18,25, \ldots \]

Ask by Nguyen Valdez. in the United States
Mar 11,2025

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The 56th term of the sequence is 389.

Solution

The arithmetic sequence is given by: \[ 4,\, 11,\, 18,\, 25,\, \ldots \] The first term is \(a_1 = 4\) and the common difference is: \[ d = 11-4 = 7 \] The formula for the \(n^{\text{th}}\) term of an arithmetic sequence is: \[ a_n = a_1 + (n-1)d \] To find the \(56^{\text{th}}\) term, substitute \(n = 56\), \(a_1 = 4\), and \(d = 7\): \[ a_{56} = 4 + (56-1) \times 7 = 4 + 55 \times 7 \] Calculate \(55 \times 7\): \[ 55 \times 7 = 385 \] Now, add the first term: \[ 4 + 385 = 389 \] Thus, the \(56^{\text{th}}\) term is \(\boxed{389}\).

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To find the \( 56^{\text{th}} \) term of the arithmetic sequence \( 4, 11, 18, 25, \ldots \), we first need to identify the first term and the common difference. The first term \( a \) is \( 4 \) and the common difference \( d \) can be determined by subtracting the first term from the second term: \[ d = 11 - 4 = 7. \] The formula for the \( n^{\text{th}} \) term of an arithmetic sequence is given by: \[ a_n = a + (n-1) \cdot d. \] Now, substituting \( a = 4 \), \( d = 7 \), and \( n = 56 \) into the formula: \[ a_{56} = 4 + (56 - 1) \cdot 7. \] Calculating \( (56 - 1) \cdot 7 \): \[ 55 \cdot 7 = 385. \] Now, substituting this value back into the formula: \[ a_{56} = 4 + 385 = 389. \] Thus, the \( 56^{\text{th}} \) term of the sequence is \(\boxed{389}\).

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