Which explains wether or not the graph represents a direct variation? LOOK AT THE PHOTO pls pls pls help

Find the solutions for a triangle with a =16, c =12, and b = 63º

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

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x