ind the 54 th term of the arithmetic sequence \( -7,-23,-39 \),
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To find the 54th term of the arithmetic sequence, we first need to determine the first term and the common difference. The first term \( a \) is \( -7 \). To find the common difference \( d \), we can subtract the first term from the second term: \[ d = -23 - (-7) = -23 + 7 = -16. \] The formula for the \( n \)-th term of an arithmetic sequence is given by: \[ a_n = a + (n-1)d. \] Plugging in the values for the 54th term (where \( n = 54 \)): \[ a_{54} = -7 + (54-1)(-16). \] \[ = -7 + 53(-16). \] \[ = -7 - 848. \] \[ = -855. \] Therefore, the 54th term of the arithmetic sequence is \( -855 \).