3 years ago

-7/2 x (-7/5) pls help asap will mark brainliest if correct

Mathematics

2 answers:

lidiya [134]3 years ago

7 0

Answer:

$-\frac{7}{2}*-\frac{7}{5}=\frac{-7*-7}{2*5}=\frac{49}{10}=4.9$

Ymorist [56]3 years ago

7 0

Yea what the person above me said

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Use the formula to evaluate the series 1/4 + 1/9 + 1/27 + 1/81.

Dmitriy789 [7]

Is the first term supposed to be 1/4, or did you actually mean 1/3?

I'll assume the latter. Write

$S=\dfrac13+\dfrac19+\dfrac1{27}+\dfrac1{81}$
$S=\dfrac13+\dfrac1{3^2}+\dfrac1{3^3}+\dfrac1{3^4}$
$\dfrac13S=\dfrac1{3^2}+\dfrac1{3^3}+\dfrac1{3^4}+\dfrac1{3^5}$
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$\dfrac23S=\dfrac13\left(1-\dfrac1{3^4}\right)$
$S=\dfrac12\left(1-\dfrac1{81}\right)$
$S=\dfrac{40}{81}$