A triangle has one angle that measures 81° and one that measures 37° what is the measure of the third angle

Explain how you can use the associative property to evaluate (7x50)x4.

Can you me find the missing length. i attached an image.

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