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Please help me answer this!!!

Please help me answer this!!!-example-1
User Tariff
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a_1 is the first term of the sequence, which is
\boxed{-4}.


r is the common ratio of the sequence, the number that you multiply one term by to generate the next term. Here, we see that multiplying by -2 will generate the next term, so
\boxed{r=-2}.

We use the formula
S_n=(a_1(r^n-1))/(r-1) to find the sum of the first 6 terms - just plug in our values for
a_1 and
r:


S_6=(-4((-2)^6-1))/(-3)=(-4(63))/(-3)=\boxed{84}.

User Eduardo Iglesias
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