Which technique is used to separate helium from a mixture of helium and methane

If a || b and e || f, what is the value of y ?

Modern weaponry has increased the number of deaths in wars and violent conflicts.

Asap! will give brainiest when a heat wave strikes a region causing more people to run air-conditioning units, electrical demand increases. what needs to be done to meet this increased demand? raising the control rodslowering the control rodsremoving the control rods