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2 years ago

6

This right? ppl giving me mixed answersPlEASE HELPPPP

1 answer:

almond37 [142]2 years ago

4 0

Answer:

Uh yeah Its right...i think

Just make sure if its right

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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

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

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2 years ago

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1 year ago

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5. Juliette works at a department store and earns $11.20 per hour. Last week she worked 32 hours.

tatuchka [14]

$358.40
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2 years ago

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A migrating bird flies 390 miles in 15 hours. How many miles does it fly in 4 hours?

viva [34]

Answer:

104

Step-by-step explanation:

390/15=26

26 times 4 is 104

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