Find the First Term a_n=12-3n

$a_{n} = 12 - 3 n$

Step 1

Substitute in the value of $n$ to find the $n$ th term.

$a_{1} = 12 - 3 \cdot 1$

Step 2

Multiply $- 3$ by $1$ .

$a_{1} = 12 - 3$

Step 3

Subtract $3$ from $12$ .

$a_{1} = 9$