Help!I really need this

What is the inverse of the function f(x) = 2x + 1?

How can the correlation in the scatter plot graph below best be described? positive correlation negative correlation both positive and negative no correlation

Suppose you are an avid reader and are looking to save money on the cost of books instead of paying about $20 for each book, you decide to look into purchasing a kindle for $120 you can purchase e-books for about $5 each 1. find the slope-intercept equation for the cost of the hard copy of books using x to represent the number of books 2. find the slope-intercept equation for the cost of the kindle with cost of e-books using x to represent the number of books