Compute the first four partial sums $\displaystyle {S}_{{1}},\ldots,{S}_{{4}}$  for the series having $\displaystyle {n}$ ^th term $\displaystyle {a}_{{n}}$ starting with $\displaystyle {n}={1}$  as follows.

    $\displaystyle {a}_{{n}}={9}-{4}{n}$

 $\displaystyle {S}_{{1}}=$   

 $\displaystyle {S}_{{2}}=$ 

 $\displaystyle {S}_{{3}}=$   

 $\displaystyle {S}_{{4}}=$