Write a Formula for the General Term (The Nth Term)of $r a _ { n }$

question 268

Multiple Choice

Write a formula for the general term (the nth term) of the arithmetic sequence. Then use the formula for $r a _ { n }$ to find $a _ { 20 }$ , the 20th term of the sequence.
- $$\mathrm { a } _ { 1 } = - \frac { 1 } { 5 } , \mathrm {~d} = \frac { 3 } { 5 }$$

• A) \(a _ { n } = \frac { 3 } { 5 } n - \frac { 4 } { 5 } ; a _ { 20 } = \frac { 56 } { 5 }\)
• B) \(a _ { n } = \frac { 3 } { 5 } n - \frac { 1 } { 5 } ; a _ { 20 } = \frac { 59 } { 5 }\)
• C) \(a _ { n } = - \frac { 1 } { 5 } n + \frac { 4 } { 5 } ; a _ { 20 } = - \frac { 16 } { 5 }\)
• D) \(a _ { n } = - \frac { 1 } { 5 } n + \frac { 3 } { 5 } ; a _ { 20 } = - \frac { 17 } { 5 }\)

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