ANSWER
The height of the basketball hoop is

Step-by-step explanation
Let the height of the basketball hoop be x feet.
The shadow of the basketball hoop is 9 ft long.
The height of Jack is 5.5 feet.
Jack's shadow is 9 ft long.
By similar triangles,

Multiply both sides by 5.5
This gives us,



The height of the basketball hoop is 14⅔ feet