Sam is collecting pennies. On the first day of the month, Sam is given 11 pennies. Each day after than he gets 7 more pennies. Which of the following equations defines how many pennies he has after the nth day?
A. an = 7n + 4
B. an = 11n + 7
C. an = 77n - 77
D. an = 7n + 11
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