if i added no salt to my experiment and it was 0 the first time how far would the Distance of the egg from the bottom of the cup

Without any salt added to the water in the cup, the egg will sink to the bottom as salt is usually added to increase the density of the water and make the egg float. Therefore, the distance of the egg from the bottom of the cup would be 0 when no salt is added.

whats the cm?

The distance of the egg from the bottom of the cup would be at a depth of 0 cm when no salt is added to the water, as the egg would sink to the bottom.

if i added salt this time what would the centimeters be?

If salt is added to the water in the cup, the egg should float on the surface of the water. The specific distance of the egg from the bottom of the cup will depend on the amount of salt added and the density of the water. Usually, the egg would be at the surface or slightly submerged, depending on the density of the saltwater solution created. The specific measurement in centimeters would need to be determined by actually performing the experiment with the correct measurements.