Use the data in the table to express the value of the nth term of the arithmetic
sequence as a function of n. Then use that formula to find the twelfth term of the
sequence.

A) f(n) = 1 + 6(n - 1); 67
B) f(n) = 6 + 7(n - 1); 83
C) f(n) = 6 + (n - 1); 17
D) f(n) = 6 + 6(n - 1); 72