In the new homework 2, I'm getting 3 overflows for the last 3 questions.   Am I doing something wrong?  

for B) I'm adding  1100011 + 1010101 = 10111000.   The CIN is 0 and the COUT is 1. If CIN and COUT the opposite, that's ok, right?  Then I do check the range of the answer and it's between -64->63, but -29+-43 is -72.   This falls out of the range, so even with the calculations I did before, it's an overflow.

For C)  I'm ending up doing 10110+11101 = 110011 <- has 6 bits.   Now the CIN = 1 and COUT = 1, meaning this is an overflow, right?

For D) I just added them in decimal form coming out to -92 and checked the range which is -64-> 63.  This is out of range and thus, it's another overflow.

Seeing 3 overflows out of 4 problems is making me worry if I did something wrong.