Could someone give me da answers

Need solving this second acceleration problem.

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

Okay so i didn't get this problem petro bought 8 tickets to a basketball game he paid a total of $200 write an equation to determine whether each ticket cost $26 or $28 so i didn't get this question so yeahyou have a good day.