These tables represent a quadratic function with a vertex at (0, -1). What is the average rate of change for the interval from x = 7 to x = 8?
Interval
ху
0 -1
1 --2
. -5
-10
4.
-17
5 -26
6 -37
WN
0 to 1
1 to 2
2 to 3
3 to 4
4 to 5
5 to 6
Average rate
of change
-1
1-2
-3
1-2
45
1-2
17
1-2
19
1-2
--11
A. -65
B. -50
C. -15
D. -2