__ 31. Write an explicit and recursive formula for the sequence 4, 7, 10 ... A. an = 3n + 1 a1 = 4 an = an-1 + 3 B. an = 4n + 1 a1 = 4 an = an-1 + 3 C. an = 2n - 2 a1 = 4 an = an-1 + 3 D. an = 3n - 1 a1 = 4 an = an-1 + 3 ____ 32. Write an equation of a parabola with vertex (0, 0) and focus (0, 6). A. B. C. D. ____ 33. What are the first five terms of the sequence: an = 7 - 3n? A. 4, 7, 10, 13, 16 B. 4, 1, 2, 5, 8 C. 7, 4, 1, 2, 5 D. 7, 10, 13, 16, 19 ____ 34. What are the first five terms of the sequence a1 = 4 an = an-1 + 7? A. 4, 3, 10, 17, 24 B. 1, 4, 7, 10, 13 C. 4, 11, 18, 25, 32 D. 1, 2, 3, 4, 5