Answer
First three terms : $2,-1,-4$ ; Last Term :$-85$ and Sum $-1245$
Work Step by Step
Here, $a_n=-3i+5$
Plug $i=1,2,3$, in the above given equation.
Then we have the first three terms are: $2,-1,-4$
Last term : $a_{30}=-3(30)+5 =-90+5=-85$
The sum of an arithmetic sequence is given by: $S_n=\dfrac{n}{2}[a_1+a_n]$
or, $S_{30}=\dfrac{30}{2}[2+(-85)]=-1245$
Hence, First three terms : $2,-1,-4$ ; Last Term :$-85$ and Sum $-1245$
