Write 19,000,000,000 in scientific notation

Do more republicans (group a) than democrats (group b) favor a bill to make it easier for someone to own a firearm? two hundred republicans and two hundred democrats were asked if they favored a bill that made it easier for someone to own a firearm. how would we write the alternative hypothesis?

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?

:)i need to know on which ones are corresponding, alternate interior, alternate exterior, or none of these.