I dont even know where to start

Step-by-step explanation:

( -1, 14 ) and (9, 14) notice the y coordinate is the same and the distance between points is 10 (from -1 to 0 is 1 and from 0 to 9 is 9 , 1+9 =10)

The axis of symetry is in the middle between the points so is at

x= (9- 10/2) = 9-5 =4

x=4

point (2, 2), vertex (5, -2.5), equation y= a(x-h)²+k

where h=5, k= -2.5, x=2, y=2 so substitute

2= a( 2-5)² -2.5

2= 9a -2.5

2+2.5 = 9a

4.5/9 =a

0.5 = a

25% is the answer