Have an infinite number of significant figures

Gymnast always perform on padded mats. how does the mats protect the gymnast

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these