Problem 42 - College Algebra Essentials

Question

Give an example of a number that is a rational number, an integer, and a real number.

Step-by-Step Solution

Answer

An example of a number that is a rational number, an integer, and a real number is 2.

Step 1: Understanding the Definitions

First, understand what each of these types of numbers are. Rational numbers can be expressed as the ratio of two integers. An integer is a whole number that can be zero, positive or negative. Real numbers include all integers, fractions, and irrational numbers.

Step 2: Finding a Number

Since we're looking for a number that fits all three categories, we can choose any integer, because all integers are rational (can be expressed as a ratio where the denominator isn't zero) and are also considered real numbers.

Step 3: Confirmation

Let's choose the number 2. It's an integer, it's also rational because it can be expressed as 2/1, and it's real because it exists on the number line.