Someone me with these two problems, the first one you got to change it into scientific notation, you so much!

What happens when an acid dissolves?

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage