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
х
0
1
2
у
-1
-2
-5
-10
-17
-26
-37
Average rate
of change
-1
1-2
-3
]-2
-5
1-2
-7
1-2
-9
1]-2
-11
O to 1
1 to 2
2 to 3
3 to 4
4 to 5
5 to 6
3
4
5
6
O A. -15
OB. -2
C.-65
о
D. -50