How do i work this problem out easily

Which questions would most a reader identify the author's purpose for writing? check all that apply. what type of text is this? what type of reviews did the book receive? how many copies of the book have been sold? what is the central idea? how does this text make one feel?

Find the domain and range of the following function f(x) = 51x - 21+ 4

Which graph has figures that can undergo a similarity transformation to justify that they are similar? (obviously not the third one)