Answer:
an = 42n - 42
Explanation:
1. Distribute the 7 to the terms inside the parentheses:
an = 7 * (n-1) * 6
2. Simplify the expression inside the parentheses:
an = 7 * (6n - 6)
3. Distribute the 7 to each term inside the parentheses:
an = 42n - 42