Hey experts I need help on 4 & 5

For "a." above, is that number positive or negative? Explain (you'll need a couple of sentences here to properly answer the question) Given a 13 bit address bus, how many unique addressed could be accessed? Given a hard disk with 4.3 TB of data, what size address bus would be required to access all of the bytes Show your work. For j above, treat the two numbers as signed, what is the res in decimal? Convert that to hex