Chapter 1.1, Problem 2ED

Replace ? with < or > in each of the following:

$\begin{array}{l}\left(\text{A}\right)-1?3\text{ and }2(-1)?2(3)\\ \left(\text{B}\right)-1?3\text{ and }-2(-1)?-2(3)\\ \left(\text{D}\right)12?-\text{8 and }\frac{12}{4}\text{?}\frac{-8}{4}\\ \left(\text{D}\right)12?-\text{8 and }\frac{12}{-4}\text{?}\frac{-8}{-4}\end{array}$

Based on these examples, describe the effect of multiplying both sides of an inequality by a number.