Amanatee can swim 5 mi in 1 and 1/4 hour if the manatee swims at the same average speed how far can it swim in 1 hour

Can someone explain the elimination method to me for this problem?

Chandler was a caretaker at the state zoo. he noticed that the number of animals adopted by the zoo increased at a constant rate every year since 2010. which of the following graphs shows the slowest rate at which the animals in the zoo were adopted?

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.