**Rational Numbers**

Rational numbers are numbers that can be expressed as a fraction of two integers, where the denominator is not zero. In other words, rational numbers can be written in the form a/b, where a and b are integers and b is not equal to zero.

**Examples of Rational Numbers**

Let's examine the given options and determine which of them are rational numbers.

1. 3/4: This is a rational number since it can be written as a fraction of two integers, where the numerator is 3 and the denominator is 4.

2. -2.5: This is also a rational number as it can be expressed as -5/2. Although the number is written in decimal form, it can still be represented as a fraction of two integers.

3. √2: This is an irrational number. Irrational numbers cannot be expressed as a fraction of two integers. The square root of 2 is a non-repeating and non-terminating decimal.

4. 0.333...: This repeating decimal can be expressed as a fraction. It is equal to 1/3. So, this is a rational number.

5. -7: Whole numbers and integers are also considered as rational numbers. Since -7 is an integer, it is a rational number.

**In Summary**

Based on the given options, the following numbers are rational:

1. 3/4
2. -2.5
3. 0.333...
4. -7

These numbers can all be expressed as fractions of two integers and therefore fall under the category of rational numbers.

The rational number includes all positive numbers and negative numbers and zero that can be written as a ratio ( fraction) of one number over another . whole numbers, integers, fractions, terminating decimals, and repeating decimals are all rational numbers.