A compound contains 40% calcium 12% carbon, and 48% oxygen by mass. What is the empirical formula of this compound

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .

Idon't know hope someone you

Its the second one nonmetals are moldable and easily shaped