The formula for volume is V=Bh where B is the area of the base. plug in what they have given you: 600=B(15) you can divide both sides by 15
40=B We know that a cylinder's base is a circle so we can use the area f formula for a circle to solve for the radius. 40 = pi(r)^2 divide both sides by pi to get the r^2 alone 40/pi=r^2 square root both sides to get rid of the square you should get r=3.5 approximately
