PLEASE HELP I’LL GIVE BRAINLIEST IF ITS RIGHT
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What's the difference between: x≥0 and nonnegative integer. ?

Find the area of the unshaded square

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