Tax on cigarettes was increased by 5% the price of certain pack became 5.60 $ find orignal price

Find the sixth term of the following geometric sequence.

If there are 825 students at cherry hill high school and 4 out of every 5 students voted in the student council election, how many students voted?

Sound travels about 750 miles per hour. a) suppose it takes about 1.5 seconds to hear the echo. how far away is the canyon wall, in feet? for this i got 825 ft b) suppose you stand 1,925 feet from the canyon wall and sound the horn. how long will it take to hear the echo? (i'm stuck on this)