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

question 177

Multiple Choice

Write a formula for the general term (the nth term) of the arithmetic sequence. Then use the formula for $$\mathbf { a } _ { \mathbf { n } }$$ to find $$a _ { 20 }$$ , the 20th term of the sequence.
- $21,12,3 , - 6 , \ldots$

• A) \(a _ { n } = 30 - 9 n ; a _ { 20 } = - 150\)
• B) \(a _ { n } = 21 - 9 n ; a _ { 20 } = - 159\)
• C) \(a _ { n } = 9 n - 30 ; a _ { 20 } = 150\)
• D) \(a _ { n } = 9 n - 21 ; a _ { 20 } = 159\)

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