Use a pen and a paper to solve the following $($show the steps to solve the problems$)$:

Change to Binary representation the following $($the number of bits of the binary representation must have $8$ bits$)$:

a$.4$

b$.-26$

Change to Decimal representation the following eight bit unsigned binary patterns:

a$.{10001000}_2$

b$.{00001001}_2$

Change to Decimal representation the following signed binary patterns:

a$.{111111110}_2$

b$.{01000001}_2$

Add the following:

a$.{00000101}_2+{00000011}_2$

b$.{?}^{{11110000}_2}+{10000000}_2$

Subtract the following:

a$.{00010000}_2-{00000001}_2$

b$.{00001101}_2-{00001011}_2$