Answer:
an = a(n-1) -4
Step-by-step explanation:
From the table we see that
a1 = 15 , a2 = 11, a3 = 7 , a4= 3, a5 = -1...
Notice the numbers decrease by 4 so
a2 = a1 -4
a3 = a2 -4
a4 =a3 -4
a5= a4-4
generalized we will have
an = a n-1 -4
