
The maximum height is the y-coordinate of the vertex (x,y) of the parabola.
First find the x-coordinate using the formula:

Now plug the value into the equation and find the y-coordinate:

The maximum height is 36 feet.
9a)
4x - 2 + 30 = 68
4x + 28 = 68
4x = 40
x = 10
9b)
y = 180 -68
y= 112
Answer:
D
Step-by-step explanation:
Square root of 4 is 2
square root of 9 is 3
so square root of 5 should be somewhere between 2 and 3 (closer to 2)