Help with with this congruent and similar stuff please

Find the value of x for which abcd must be a parallelogram -9-6x x-30

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

What is 1/3x5 on anuber line what does it look like on a number line