Find a Formula for A_n for the Arithmetic Sequence $a _ { n } = 7 \left( - \frac { 1 } { 8 } \right) ^ { n - 1 }$

question 338

Multiple Choice

Find a formula for a_n for the arithmetic sequence.
A₁ = 7, d = -8

• A) \(a _ { n } = 7 \left( - \frac { 1 } { 8 } \right) ^ { n - 1 }\)
• B) \(a _ { n } = - 8 + 7 ( n - 1 )\)
• C) \(a _ { n } = 7 - 9 n\)
• D) \(a _ { n } = 15 - 8 n\)
• E) \(a _ { n } = 7 - 8 ^ { n - 1 }\)

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