In an arithmetic sequence, the nth term an is given by the formula a = a + (n-1)d, where a is the first term and d is the common difference. Similarly, in a geometric sequence, the nth term is given by an = a r-1. Here r is the common ratio. Use these formulas to determine the indicated term in the given sequence. The 19th term of 19, 49, 79, 109,... The 19th term of the sequence is (Simplify your answer.)