a carpenter who is installing cabinets uses thin pieces of material called shims to fill gaps. the carpenter uses four shims to fill a gap that is 1.2 centimeters wide. three of the shims are 0.75 centimeters, 0.125 centimeters, and 0.09 centimeters wide. what is the width of the fourth shim?
0.75 + 0.125 + 0.09 + x = 1.2
So now just find x