Is 4.25 a rational number

Yes, 4.25 is a rational number

Any terminating decimal can be written as a fraction of two integers.

In this case, 4.25 = 4.25/1.00 = 425/100

in mathematics, a function is a relationship between two variables such that the value of one of the variables, called the dependent variable, is determined by the value of the other variable, called the independent variable. there is a specific term we use to describe the set of independent variables of a function.