125 or -27 or -64 or 8 or 343 or 1
64
99,001
The number is: 36725918 In descending order that is: 98765321 The pairs of numbers that have as many digits between them in both are: 3,9 5,8 6,7 So there are three pairs.
9 on apex
This sum can be any of 14 (from the number 95 or 59), 12 (from the number 84 or 48), 10 (from the number 73 or 37), 8 (from the number 62 or 26), 6 (from the number 51 or 15), or 4 (from the number 40).
19
18
899
28
37
64
99,001
63
63
A digit is part of a number. the number 23 has two digits 2 and 3.
It is easiest to explain with an example. Suppose you have a number 4627. Then the number obtained by reversing [the order of] its digits is 7264. The difference between them is the bigger number minus the smaller number. So here it would be 7264 - 4627 = 2637.
The smallest two digit number is 00 (a number used as a wire gauge) and the largest is 99, so the difference between the largest and smallest 2-digits numbers is 99 (99 - 00)