What is the sum of the first five positive integers?

The sum of the first five positive integers is calculated by simply adding those integers together. The first five positive integers are 1, 2, 3, 4, and 5. When you add these numbers:

1 + 2 + 3 + 4 + 5 = 15

Thus, the correct answer is 15. This method of summing the first few integers is often used to reinforce the concept of addition and helps establish a foundation for understanding series and sequences in mathematics.

The other values listed are not derived from adding those specific integers together. For instance, 10 is too low, as it does not account for all five integers, while 20 and 25 are too high, reflecting either a misunderstanding of the addition or possibly the inclusion of integers beyond the first five. Therefore, the appropriate sum, confirmed through direct calculation, is 15.