(04.06 LC)
The first four terms of a sequence are shown below:
9,5, 1,-3
Which of the following functions best defines this sequence?
an = an-1-4; where a1 = 9
an = an-1 +5; where a1 = 9
an = an-1 +4; where a1 = 9
O
an = an-1-5; where a1 = 9