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konstantin123 [22]
2 years ago
11

Help pls!?!?!?!!! This is algebra 2

Mathematics
1 answer:
Tresset [83]2 years ago
5 0

\boxed{\sf a_n=\dfrac{(-1)^n}{5n}}

a:-

\\ \sf\longmapsto a_1=\dfrac{(-1)^1}{5(1)}

\\ \sf\longmapsto a_1=\dfrac{-1}{5}

\\ \sf\longmapsto a_1=-5

b:-

\\ \sf\longmapsto a_4=\dfrac{(-1)^4}{5(4)}

\\ \sf\longmapsto a_4=\dfrac{1}{20}

c:-

\\ \sf\longmapsto a_{30}=\dfrac{(-1)^{30}}{5(30)}

\\ \sf\longmapsto a_{30}=\dfrac{1}{150}

d:-

\\ \sf\longmapsto a_{19}=\dfrac{(-1)^{19}}{5(19)}

\\ \sf\longmapsto a_{19}=\dfrac{-1}{95}

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On simplifying the above expression we get:

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Answer:

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