<span>yes; the number is written in scientific notation</span>
For this case we have that, by definition, the domain of a function is given by all the values for which the function is defined.
Having said that, we have the following function:

It is not defined when the denominator is equal to 0. That is:

Thus, the domain of r (x) is given by all real numbers except 1.
Answer:
all real numbers except 1.
Option A
14. B (4, -2)
15. I am not exactly sure about this one but I would say either A or B.