A 3.0 l sample of helium gas is stored in a rigid, still container at 25 degrees Celsius and 1.0 ATM pressure. The pressure is increased to 1.5 ATM and the temperature is increased to 125 degrees Celsius. What is the new volume of the gas?

The answer options is d

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 .