OK I can do a and b. In binary there is no + or - so all numbers are unsigned integers unless otherwise specified, therefore converting the binary no to a decimal will give a). We know computers deal with signed integers too, in this case the first digit in binary assigns + or - to the figure (not sure which is which), so the signed int will be -/+ from the first digit and the decimal will be the representation of the rest of the digits.. not sure about c.

I suggest googling for how computers use numbers for this rather than just binary