Apearl is formed in one of every 10,000 oysters what percent of oysters make pearls

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

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