Final answer:
As x approaches a certain value, a limit calculator can help us determine the value that a function approaches.
Step-by-step explanation:
When x approaches a certain value, we can determine its behavior by evaluating the limit of a function. In this case, as x approaches a value, we can use a limit calculator to find the limit of the function. A limit calculator helps us determine the value that a function approaches as its input approaches a particular value. So the correct answer is A) Limit calculator.