I need help with these question on Processor managment using Linux OS

Please give detailed information

1 - How many times will the following crontab entry execute during January 2018?

0 0 * 1 1 rm -r /root/backup/* 

2 - How many times will the following crontab entry execute during January 2018?

0 0 * 1 6 rm -r /root/backup/* 

3 - List all of the dates the following crontab entry will execute during 2018 (this answer is a little tricky).

0 0 1/10 * 7 rm -r /root/backup/* 

4 - How often will the following crontab entry execute?

* * * * * users >> /root/users.log 

5 - What crontab time interval would execute a command at 12:00pm on the first day of each year?

6 - What crontab time interval would execute a command at 1:00am every Sunday?

Thanks.