Urgent help needed! thankyou! (help needed for (b) and (c). which is why i put 20 points. 10 for each question)

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?

Standard deviation of 19,29,21,22,23

The square root of 9x plus 7 plus the square rot of 2x equall to 7