Because there is a 1-to-1 mapping between the points on the line and the set of real numbers.
correspondent
That's called a number line.
absolute power
That's called a number line.
Yes. A real number is any number that could be plotted on a number line. For example, 3/4 could be plotted on a number line, and so it is real. Only square roots of negative numbers are not real: they are called imaginary.
It is the real number whose length represents the distance from the zero on the line to the point on the line.
Any real number can correspond to a point on a line.
Yes, as long as the number line is entirely real.
No. The real number line corresponds to rational AND irrational numbers.
A real number can be represented by a point on the number line.
1.21 is a real number that can be found on the number line
magnitude