Answer:
C
Step-by-step explanation:
y = (x-1) (x+4)
when y=0
x=1 and x= -4
so select C
5.5
1, 2, 5, 5, 6, 8, 9, 9
5+6=11
11 divided by 2= 5.5
20.825
7.985
+12.84