Need help rn, DONT answer if u dont know please

Example 1B
Find m
Thanks

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

Ling is using fraction strips to add 2/3 and 7/12's the sum is one whole plus how many twelves?

Can someone me with these questions? ?