Question

Which of the following is an example of a rational number? A. π B. √ 9 C. √ 8 D. 3.8362319

Answer 1

B. Square root of 9 (which is 3) because it is the only one that is a number that terminates. All others are non repeating.

Answer 2

For this case, we have that by definition:

The rational numbers: are all those that can be represented as the quotient of two whole numbers or, an integer and a positive natural; that is, a common fraction
`\frac {a} {c}`with a and b distinct from zero.

Thus,
`\sqrt {9} = 3 = \frac {3} {1}`is rational

An irrational number is a number that can not be expressed as a fraction
`\frac {a} {c}`, where a and c are integers and c is different from zero. Thus,
`\pi, \sqrt {8}\ and\ 3.8362319` are irrational numbers.

Answer:

`\sqrt {9}`