What will happen if you do not submit the quiz within the time frame? What will happen if you let the moodle's session expire and the quiz submits black answers? 

You can repeat this quiz until you get 20 (until the quiz closes).

If you do one of the mistakes shown above, can you ask the professors for a second chance to submit the quiz?

Should you have this quiz and its correct answers with you when you are doing the main quizzes?

Consider a question that asks for you to compute an interest rate (or some percentage) and you believe that the answer is 5.62%. 

How should you insert it?

How many quizzes will you do in this course? (Note that this quiz does not count.)