In the meantime, on your observation that you found 5 hosts, but Question 1 is expecting a different answer than 5
I can confirm that while the .10 host does indeed exist, it’s not in scope for your scan in Task 1, so it’s not expected to count towards the total host count.
Task 1 specifically calls for running masscan to identify hosts that have one of the top 100 ports open. The .10 host exists, but at least in my testing, it’s only running ports 8080 and 50,000 - neither of which are included in the top100.conf file, so it wouldn’t show up as part of Task 1.