What does it mean when a compound's chemical formula does not include any numbers?

On a floor there are several 1-4 mm elongated drops leading away from a body lying in a pool of blood. the the forward wall there is a sigzag pattern and on the walls to the right side there is a linear patter

What best describes the dropping height of a ball that bounces back up to a height of 45 cm

Aheterozygous normal male marries a woman with a sickle cell anemia. give the genotypes and possible phenotypes of the offspring