The area A of the rectangle with sides of 4X and 5 is described with the inequality 100 ≤ A ≤ 1,000. Select the compound inequality for the area written in terms of x.
A. 100 ≤ 10 + 8x ≤ 1,000
B. 100 ≤ 18x ≤ 1,000
C. 100 ≤ 9x ≤ 1,000
D. 100 ≤ 20x ≤ 1,000
Part B
Choose the numbers to finish this statement.

A compound inequality for this situation is

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