If I am trying to test which brand of battery lasts the longest, what is my independent variable? My dependent variable?

Why cooking gas has a typical smell

An object is dropped from a tower, 400 ft above the ground. the object's height above ground t seconds after the fall is s(t)equals400 minus 16 t squared. determine the velocity and acceleration of the object the moment it reaches the ground. the velocity of the object the moment it reaches the ground is nothing ft/s.

Which planet do you think would be easiest for humans to colonize some day?