Juan has invested $3500 in a stock transaction. he later sold the stock and received $4553.50. what was juan's return on investment (roi)? a.) about 23.1% b.) about 130% c.) about 76.9% d.) about 30.1%

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