hi, I'm attempting a physics problem... it is: What, roughly, is the percent uncertainty in the volume of a spherical beach ball whose radius is r= 2.86 plus or minus 0.09 m. Now, I tried to find the percent uncertainty by just doing .09/2.86, but I'm assuming I need to do something with the radius (in the way of changing it to the full volume...) before I can calculate this. I know that to find the volume it would be 4/3 pi R cubed, but after that... how does the volume correlate to the .09? Does that need to be altered as well? I know the answer is 9% but I would like to actually understand how the question is done! I'm just confused. Any help would be greatly appreciated!