The first four terms of a sequence are shown below: 9,5, 1, -3
Which of the following functions best defines this sequence?
Of(1) = 9, f(n + 1) = f(n) - 4; for n 2 1
Of(1) = 9, f(n + 1) = f(n) + 4; for n 2 1
Of(1) = 9, f(n + 1) = f(n) - 5; for n 2 1
Of(1) = 9,f(n + 1) = f(n) + 5; for n 2 1