A gas tank contains helium, hydrogen, and oxygen gas. If the partial pressure of both helium and hydrogen is 200 torr each, and the partial pressure of oxygen is 430 torr, what is the total pressure of the gas tank?

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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 .