True
An absolute-value function
2
How about 27 whose cube root is 3 which is a rational whole number.
It's rational. It can be written as the quotient of two numbers whose HCF is one.
It is true that a rational function is a function whose equation contains a rational expression. This is used in various math classes.
True
a ractional function
Yes as for example x = 5 which is a straight vertical line parallel to the y axis
An absolute-value function
A linear function is a function whose graph is a straight line.
2
None, if the coefficients of the quadratic are in their lowest form.
A linear equation
f(x) = 1 if x is rational f(x) = 0 if x is irrational But there is no specific question about this function. It is a well defined function whose domain is the real numbers and whose codomain consists of the two values, 0 and 1. It is a function with infinitely many discontinuities, and an integral which is 0.
How about 27 whose cube root is 3 which is a rational whole number.
True