10-9000

Do you mean one of these?

• Subtraction: 10 − 9000 = -8990.

• Range/interval questions (inclusive):

  • Number of integers from 10 to 9000 inclusive: 9000 − 10 + 1 = 8991.
  • If exclusive endpoints (10, 9000): 9000 − 10 = 8990.

If you can clarify which interpretation you need (and whether endpoints are included), I’ll tailor the steps.