Janice's science class weighed 7 identical balls on a scale. The combined weight of the balls was 89.06 kilograms. To the nearest thousandth of a kilogram, what was the weight of each ball?

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