What are the differences between signed 1’s complement notation and signed 2’s complement notation for representation of negative fixed point numbers?

What are the differences between signed 1’s complement notation and
signed 2’s complement notation for representation of negative fixed point
numbers? Find the range of numbers that can be represented in both these
notations, if the size of the notation is 8 bits (including sign bit). Explain the
difference in the range of the two notations. Perform the following
arithmetic operations using signed 2’s complement 8-bit representation.
(Please note that the numbers given below are in decimal notation)
i) Subtract 30 from –98
ii) Add 69 and 59
Please indicate the overflow if it occurs. How haveyou identified the
overflow?