What is the axis of symmetry for f(x) = 2x^2+4x+2

Which equation represents the function on the graph?

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

Given the following linear function sketch the graph of the function and find the domain and range. ƒ(x) = -5x + 4