What is the value of a2 in the sequence? 2, 5, 10, 17,  2 5 10 17 what is the value of a3 in the sequence? −4, −2, −1/2, −1/4,  −4 −3 −1/4 −1/2 which answer describes the type of sequence? 3, 9, 15, 21,  arithmetic neither arithmetic nor geometric geometric which answer describes the type of sequence? 4, 9, 13, 22,  arithmetic neither arithmetic nor geometric geometric which answer describes the type of sequence? 200, 40, 8, 1.6,  geometric neither arithmetic nor geometric arithmetic