Wats the 60% off a prize that is $20.00

Ihave trouble finding the nth term of a linear sequence

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

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