Which digit represents the tens place value in the number 15,879?

In the number 15,879, place value is assigned based on the position of each digit. The digit farthest to the right represents the units (or ones) place, the next digit to the left represents the tens place, followed by the hundreds, thousands, and so forth. In this case, the tens place is occupied by the digit 7, which indicates that there are seven tens in the number. Therefore, 7 is the correct representation of the tens place value in this specific number.