Answer:
1. Pick an object in your house that is parabolic. As an example, I will use a banana.
2. Measure its height and width.
My banana's height is 3 in, and its width is 7 in.
(see the attached image)
3. Show the parabola made by the object on a Cartesian (rectangular) plane.
(see the attached graph)
4. The approximate quadratic for that graph is:
y = (1/4)x²