$4)$ Convert $(49)$ base $10$ and $(29)$ base $10$ to $8-$bit binary, using the signed $2$s complement representation and enough bits to represent the numbers. Then, perform the following operations using binary addition:

a$)29+(-49)$

b$)(-29)+49$

c$)(-29)+(-49)$

Convert the answers back to decimals and verify that they are correct.