I have 2 problems that I'm wondering if they're right or not... Thanks for the help. 1. The problem statement, all variables and given/known data 10) What is the area, and its approximate uncertainty, of a circle of radius 3.8 x 104cm? 2. Relevant equations A=πr2 3. The attempt at a solution A=π380002 A=4536459792cm2 Then, I did the same thing with 37999 (the uncertainty is [tex]\pm[/tex] 1) to find the difference in the area to be 238758. [tex]238758/4536459792[/tex] x 100% = .0053% uncertainty. _______________________________________________________________ 1. The problem statement, all variables and given/known data 11) What, roughly, is the percent uncertainty in the volume of a spherical beach ball whose radius is r=2.86[tex]\pm[/tex]0.09m? 2. Relevant equations A=[tex]4/3[/tex]πr3 3. The attempt at a solution A=[tex]4/3[/tex]π2.863 A=97.99m3 I then did the same thing with 2.77 to get that area to be 89.03m3. 97.99-89.03=8.96 [tex]8.96/97.99[/tex]x100%=9% uncertainty.