It is a geometric mean sequence. the 2nd term is 20, the 5th term is 0.16 so the next 3 terms are found by multiplying successive terms by the constant x. 20x^3 = 0.16 which is derived by multiplying 20 by x, three times to get 0.16 So x^3 =.008 x=0.2 The first term is found by saying a1^.2 = 20, so a1 = 100 When n = 1 2 3 4 5 t(n) = 100 , 20, 4, .8, .16
