Step 1: Write out the summation of the series given
[tex]\sum ^4_{n\mathop=1}(3n+7)[/tex]
Step 2: Expand the summation
[tex]\begin{gathered} \text{when n=1} \\ 3.1+7 \\ =7+3.1 \end{gathered}[/tex][tex]\begin{gathered} \text{when n=2} \\ 7+3.2 \end{gathered}[/tex][tex]\begin{gathered} \text{when n=3} \\ 7+3.3 \end{gathered}[/tex][tex]\begin{gathered} \text{whne n=4} \\ 7+3.4 \end{gathered}[/tex]
Hence, the summation of the series is (7+3.1) + (7+3.2) + (7+3.3) + (7+3.4)
