HELP HELP IM REALLY STUCK AND I NEED HELP PLEASE (The Ksp for M₂X is 8 x 10⁻⁶) Whaet is the molar solubility in water of M₂X?

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

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Joanie wrote a letter that was 1 1/4 pages long. katie wrote a letter that was 3/4 page shorter then joagies letter. how long was katies letter