SOLUTION
Given:
[tex]\begin{gathered} For\text{ arithmetic sequence;} \\ a_n=a_1+(n-1)d \end{gathered}[/tex][tex]\begin{gathered} a_{39}=? \\ n=39 \\ d=-4 \\ a_1=-28 \end{gathered}[/tex][tex]\begin{gathered} a_{39}=-28+(39-1)(-4) \\ a_{39}=-28+38(-4)=-28-152=-180 \end{gathered}[/tex]
Final answer:
