You can only change one variable in an experiment true or false

Find the volume of the ellipsoid x^2+y^2+5z^2=36.

Solar cell a produces 100 joules of energy, when a light source is shown on it for 3 minutes. solar cell b produces 200 joules of energy when the same light source is shown on it for 5 minutes. which solar cell works better? a) solar cell b, because it produces more energy. b) solar cell b, because it generates more power. c) solar cell a, because it produces energy quicker. d) solar cell a, because it generates a greater wattage. eliminate

Asher cycles 12 miles in 16 hours. what is his speed?