Review of Inequalities

1. $x < 1904$ or $1904 > x$

Since the war started in $1904$, we want an inequality that represents years before $1904$

$x$ represents years, so we want this to be less than $1904$.

The inequality can be written $x < 1904$ or $1904 > x$.

2. $d > -7$

We want to represent account values with more than $-7$ dollars.

In mathematical terms, we want to represent account values with greater than $-7$ dollars.

$d > -7$

3. $t > 212$ or $212 < t$

Every temperature above $212^{\circ}$ is higher than the boiling point of water.

What relation does $t$ have to $212$ if $t$ is higher than the boiling point of water?

We want the inequality to say that $t$ is greater than $212$.

In other words, we want $t > 212$ or $212 < t$.

4. $r < 11$

Since Ruth is lighter than Scoonsie, she must be lighter than $11$ kilograms.

We want to write an inequality that shows weights less than $11$ kilograms.

$r < 11$