The precision of a method is being established, and the following
data are obtained 22.23, 22.18 22.25, 22.09
and 22.15%, is 22.09% a valid measurement?​

The chemical bubbles

Maybe you should get some from your teacher and learn more so you can get your grades up and maybe study a bit more

Man i dont know this answer

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.