is -2.1 a rational number
To determine if -2.1 is a rational number, we need to understand what a rational number is.
A rational number is any number that can be expressed as a fraction, where the numerator and denominator are both integers and the denominator is not zero. In other words, a rational number can be written as a/b, where a and b are integers and b is not equal to zero.
Now, let's check if -2.1 can be expressed as a fraction:
-2.1 = (-21/10)
Here, -21 is an integer, and 10 is an integer, and 10 is not equal to zero. So, -2.1 can be expressed as a fraction where both the numerator and denominator are integers. Therefore, -2.1 is a rational number.