Answer:
3
Step-by-step explanation:
3/10
0.33333333 1/3
0.375 3/8
0.4 2/5
X is the independent variable (think 'input variable'); all of the values of x which are valid (ones that don't create division by zero or square root of a negative value) is the domain.
The answer is A) 36. Hope I was able to help