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

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.
- $$\mathrm { a } _ { 1 } = - 9 , \mathrm {~d} = 0.6$$

A) $\mathrm { a } _ { \mathrm { n } } = 0.6 \mathrm { n } - 9.6 ; \mathrm { a } _ { 20 } = 2.4$
B) $a _ { n } = 0.6 n - 9 ; a _ { 20 } = 3$
C) $a _ { n } = - 9 n + 9.6 ; a _ { 20 } = - 170.4$
D) $a _ { n } = - 9 n + 0.6 ; a _ { 20 } = - 179.4$