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Find a39 of the arithmetic sequence given a1=−28 and d=−4.
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Find a39 of the arithmetic sequence given a1=−28 and d=−4.

Find a39 of the arithmetic sequence given a1=−28 and d=−4.-example-1
User Fedaykin
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13 votes

SOLUTION

Given:


\begin{gathered} For\text{ arithmetic sequence;} \\ a_n=a_1+(n-1)d \end{gathered}
\begin{gathered} a_(39)=? \\ n=39 \\ d=-4 \\ a_1=-28 \end{gathered}
\begin{gathered} a_(39)=-28+(39-1)(-4) \\ a_(39)=-28+38(-4)=-28-152=-180 \end{gathered}

Final answer:

Find a39 of the arithmetic sequence given a1=−28 and d=−4.-example-1
Find a39 of the arithmetic sequence given a1=−28 and d=−4.-example-2
User Rharvey
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