Can someone help me get started with this problem.

Which is the best for showing percentages of different types of cars sold(gas hybrid , electric , other ) in the united states ?

Oxygen and hydrogen gas are at the same temperature t. what is the ratio of kinetic energies of oxygen molecule and hydrogen molecule if oxygen is 16 times heavier than hydrogen.

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects