Discover Questions

LCD : 2x/x-1 - 3x^2+2x+1/x^3-1 + x+1/x^2+x+1=?????
Can anyone solve this for me, I need to find the least common denominator? What is the difference between production engineering & industrial engineering? The radius of a calcium ion is 94pm and of an oxide ion is 146pm.predict the crystal structure of calcium oxide? Is the earth cooling instead of heating? I really need to know! Thx ilysm :)? HOW MANY GRAMS IN ONE TROY
ONCE?