Software testing quiz questions i just can't find answer for

Hello i am solving a test in software testing and i am only missing these 3 question answers and i can't find the correct answer.

1.Fill in the blank. A _________ test is a system test performed daily or several times a week after every build. Type the correct answer into the text box.

2.Software that was extensively tested would have how many bugs per 1000 lines of code? Write your answer in numeric form in the box provided.

3.In hardware, there are essentially only how many types of faults? Write your answer in numeric form in the box provided.

Can anyone give me answer or at least a hint?