Hi guys, can you help me out with a homework question. I'm stuck and dont know what to do. Question state: A spherical balloon with radius r inches has volume V(r) = (4/3)r3. Find a function that represents the amount of air A required to inflate the balloon from a radius of r inches to a radius of r + 1 inches. Don't I just replace (r) with (r+1).. ? 3. The attempt at a solution A(r)= (4/3)pi(r+1)^3 ?? Thanks a lot.