Given a term in a geometric sequence and the common ratio find the first five terms, the explicit formula, and the recursive formula. a1 = 4, r = 5 question 4 options: first five terms: 5, 20, 80, 320, 1280; an=5*4n−1; a1=5 first five terms: 4, 9, 13, 18, 23; an=5*4n−1; a1=4 first five terms: 4, 20, 100, 500, 2500; an=4*5n−1; a1=4 first five terms: 20, 25, 30, 35, 40; an=4*5n−1; a1=4