Chapter 1.1, Problem 49E

To determine

To express: the given interval in terms of an inequality and then graph the interval.

Answer to Problem 49E

In terms of inequality the interval can be expressed as $2\le x<\infty$ .

Explanation of Solution

Given information:

An interval is given as

  $\left[2,\infty \right)$

Concept used:

An interval $\left(a,b\right)$ in terms of an inequality can be expressed as $a<x<b$ .

An interval $\left[a,b\right]$ in terms of an inequality can be expressed as $a\le x\le b$ .

An interval $\left[a,b\right)$ in terms of an inequality can be expressed as $a\le x<b$ .

An interval $\left(a,b\right]$ in terms of an inequality can be expressed as $a<x\le b$ .

Calculation:

Consider the given interval.

  $\left[2,\infty \right)$

Let us consider a variable x o express the inequality.

So, the interval can be expressed as an inequality as $2\le x<\infty$ .

Graph:

Now, graph the interval on number line as shown:

  

Here, $2$ is included to the interval and the interval goes up to infinity so, closed ball is placed for 2on the number line.