Mathematically, why am i so uneducated?

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?

In the geometric progression –3, 12, −48… what term is 3,072?

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