Fixed+Loops+(Python)

Specification
Write a program to:
 * Display 'Hello World'10 times
 * Count from 0 to 9
 * Count from 13 to 19
 * Count from 10 down to 1

Task
Add a for loop to this program, to count from 0 to 100, going up in increments of 5

Questions
What would be the value of the loop counter in each of these examples:
 * 1) for counter in range(5)
 * 2) for counter in range(10, 13)
 * 3) for counter in range(10, 60, 10)
 * 4) for counter in range(4, -4, -2)