I need help! I would appreciate if you show me the work! Thank you !

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

Asandwich shop has 18 tables. each table seats up to 4 people. to find the greatest number of people that can be seated, you can solve p4 ≤ 18. which step is the best way to solve the inequality? plz asap i repeat plz

What is the domain of the step function f(x)=[2x]-1?