What is an integer that is divisible by 2

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?

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

How do you solving the solution of each system using elimination?