Help Please! I will mark brainliest!

When turned about its axis of rotation, which shape could have created this three-dimensional object?

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches. approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *