Scalable Shapes

I'm just about done scripting the first interactive models for our ScienceSim parcel; a cube and sphere that can be scaled up or down, giving their new sizes and volumes when touched. The info is given by llSay so it appears in the lower left. The sphere volume is the only part not working yet. While the formula is indeed correct, the script calculates it differently than when I do it myself. So I've got something wrong in my order of operations or something.