Answer:
Option 3 -
; The maximum height of the water is 7 feet.
Step-by-step explanation:
Given : The height of water shooting from a fountain is modeled by the function
where x is the distance from the spout in feet.
To find : Complete the square to determine the maximum height of the path of the water.
Solution :


Completing the square by adding and subtracting
in the bracket,




The general vertex form is 
On comparing,
a=−4, h=3, k=7
The maximum height of the water is given by y-intercept i.e. k,
The maximum height of the water is 7 feet.
Therefore, Option 3 is correct.