What type of numbers can include both fractions and decimals?

Rational numbers are defined as numbers that can be expressed as the quotient of two integers, where the denominator is not zero. This definition encompasses both fractions and decimals. For example, the fraction 1/2 is a rational number, and it can also be represented as a decimal (0.5). Similarly, the decimal 0.75 can be expressed as the fraction 3/4, demonstrating the connection between the two.

In contrast, other types of numbers listed in the options do not include both fractions and decimals. Whole numbers are the set of non-negative integers (0, 1, 2, ...) and do not include fractions or decimals. Imaginary numbers are used in the context of complex numbers and do not pertain to rational numbers at all. Irrational numbers, while they can be represented as decimals, cannot be expressed as fractions of integers. For instance, numbers like π or √2 are irrational and cannot be written as a simple fraction, thus excluding them from this context.