Which of the following are mathematical sentences? Check all that apply. MULTIPLE CHOICE

A. 4 - d = 8

B. 4 - v

C. 3 + 2 = 5

D. 6

E. 5g

F. 1 < 2

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