* Exercise #1:

1. Convert hex 1B41 into binary:

	1h = 0001b
	Bh = 1011b
	4h = 0100b
	1h = 0001b

	answer: 0001 1011 0100 0001

  (the leading 0's aren't necessary, since this is math and not
   computer arithmetic - no data size was specified)

2. Convert hex 9A4 into decimal:


	9 * 16^2 + 10 * 16 + 4 = 2468
	

3. Convert binary 1001110100111 into hex:

	add leading zeros: 0001 0011 1010 0111

	0001b = 1h
	0011b = 3h
	1010b = Ah
	0111b = 7h

	answer: 13A7

4. Convert binary 0110100 into decimal:

	1*32 + 1*16 + 1*4  = 52d

	
5. Convert decimal 71 into binary:

	71 = 64 + 4 + 2 + 1, therefore, the answer is:

	1000111

	(or easier: 71 = 64 + 7, which in binary is simply: 1000000 + 111)

6. Convert decimal 253 into hex:

	253 = 256 - 3

	256 = 2^8 = 16^2 = 1 * 16^2 + 0 * 16^1 + 0 * 16^0, 
        meaning that in hex it's 100h

	Subtracting 3 we easily get the answer: FDh
		

* Exercise #2:

1.       cccc ccc
	   1110001
       +  11010111
         ---------
         101001000
	         
2.         c  ccc
	  52E12FFC 
        + 9871AB25
         ---------
          EB52DB21


* Exercise #3:

1. 127  is a positive number
   its binary representation is: 1111111  (128d - 1d)
   we add leading 0's to get the answer:  0000 0000 0111 1111

2. -65 is a negative number
   the binary value of 65 as a 16-bit value is: 0000 0000 0100 0001 (64d + 1d)
   take one's complement (flip): 1111 1111 1011 1110
   add one to get the answer: 1111 1111 1011 1111


* Exercise #4:

1. -17 is a negative number
   the hex representation of 17 as a 32-bit value is: 00 00 00 11 (16d + 1d)
   take one's complement (flip): FF FF FF EE
   add one to get the answer: FF FF FF EF

2. 255 is a positive number
   255 in hex is FF (the largest 1-byte, unsigned number)
   So the answer is simply: 00 00 00 FF 
   
* Exercise #5:

1. E6A is a negative number; let's find out its positive counterpart
   take one's complement (flip): 195
   add one: 196
   which in decimal is  1*16*16 + 9*16 + 6 = 406
   answer: -406

2. 602 is a positive number
   the answer is simply its decimal value: 6*16^2 + 0*16^1 + 0*16^0 = 1538