Copy of Limit Balloon

A balloon is pictured. Its volume is given by shown on the horizontal axis, and its radius is given by . Drag to adjust the volume of the balloon.
1. Find the volume at which the balloon pops. 2. The radius is a function of . (a) Estimate by manipulating the value of . (b) Compute exactly by using the expression for as a function of . (c) Explain what represents in words.