Question

Solve using the multiplication principal. Graph and write both set-builder notation and interval notation.

Answer 1

$2.1\text{ }\ge-1.4\text{ n}$

Divide both sides by -1.4, flip the inequality sign

set-builder notation

$\begin{gathered} \frac{2.1}{-1.4}\leq n \\ -1.5\leq n \end{gathered}$

The graph of the inequality will be as shown at the following:

the interval notation will be: [-1.5 , ∞)