-18
90
There are 1,000 positive integers between 1,000 and 9,999, inclusive, that are divisible by nine.
6
All of them from 45 to 99 ... 55 integers.
Three of them.
There are 80 such integers.
4
All the numerals are integers (positive integers)
6 positive integers. 0,1,2,3,4 & 5
The positive integers up to 4 are: 1, 2, 3, and 4. This is a total of four positive integers.
-58
666 integers.
The answer depends on how many negative integers you divide by.
Of the 729 numbers that satisfy the requirement of positive integers, 104 are divisible by 7.
90
49
There are infinitely many of them.