Late submissions: There is a penalty for late homework submissions. You will lose 10% of the grade for every late hour (For example, you'll lose 10% of your grade if you're late anywhere between 1 minute to one hour; you'll lose 40% of the overall grade if you're late by 3:01 to 4 hours, and you'll get 0 if you're late by 9:01 hours or more).
Extra credit points: HW2, HW3, and HW4 have extra credit points. That is, the homework has 150 points instead of 100 points. That is 50 extra credit points. You can use these credit points to compensate for other written homeworks. These extra credit points will not help with your grades for midterm, final, or project. They only help with your written homeworks (20% of your overall grade).