What is an interval?AA single numberBA range of numbersCA percentageDA total amount

Answering the Question: What is an Interval?

In mathematics, an interval refers to a range of numbers or values between two endpoints. Here's a breakdown of your options:

1. A single number - This does not describe an interval; it indicates just one point or value.
2. A range of numbers - This is correct, as an interval indeed consists of all numbers between two specified values. For instance, the interval [2, 5] includes all numbers from 2 to 5, including the endpoints.
3. A percentage - This is not applicable here, as percentages are not intervals but rather a way to express a part of a whole.
4. A total amount - This does not define an interval, as it refers to a specific quantity or sum.

Conclusion

The correct answer is B: A range of numbers. An interval is fundamentally the set of all numbers between two given numbers.