Help me w this. if you don’t know dont answer smh. A number line is shown below. The numbers 0 and 1 are marked on the line, as are the two other rational numbers a and b

Will a - 1 be positive or negative? explain.

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236