Five out of eight birds that visited the feeder ate the birdseed. if 60 ate the birdseed today, how many birds visited the feeder?

Ten times the square of a non-zero number is eqaul to ninety times the number

Math it's appreciated. (picture provided)

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