Alex has 5 pieces of paper, each with a different math problem. In how many ways can he give these problems to his 10 friends (he can give each friend more than one problem)

100,000 ways

Step-by-step explanation:

For each note, assign a number of friends

This can be repeated among the notes.

This is a 5 digit base 10 number

thus there are 10^5 = 100,000

There are 100,000 ways to distribute the problems among his 10 friends