What is the difference between (-15) and (+20)?

Planning for the possibility that your home might get struck by lighting and catch on fire is part of a plan for ?

Aline that intersects one of two parallel lines intersects the other also always sometimes never

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