A table of values for a quadratic function is shown.
-24
0
What are the coordinates of the quadratic function's vertex?
A
(-18, 48)
B
(-17, 49)
C
(-18.5, 16.5)
(-20.5, 36.75)
-22
-21
-20.5
-18
-15.5
-13
24
33
36.75
48
46.75
33
4