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solniwko [45]
3 years ago
9

Use a calculator to find each value ,and round to the nearest tenth:

Mathematics
1 answer:
Assoli18 [71]3 years ago
6 0
7.6
9.565
23.45
21.24
18.16
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Calculate the sum of the infinite series
Rina8888 [55]

Answer:

S_\infty=250.

Step-by-step explanation:

The given infinite series is  50+40+32+\frac{128}{5}+....


The first term of this series is a_1=50.


The common ratio is r=\frac{40}{50}.

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The sum of this infinite series is given by the formula,


S_\infty=\frac{a_1}{1-r}


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S_\infty=\frac{50}{1-\frac{4}{5}}


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S_\infty=\frac{50}{\frac{1}{5}}


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S_\infty=50\times 5


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The correct answer is C.





4 0
4 years ago
I need someone to check these answers ASAP.
Reptile [31]

Alright, 1, 2, and 4 are correct but 3 is not.

The error you made could be hard to notice but it was made. So let's put the equation up, 6x-(2x-9)=-31. Your error occurred when you didn;t distribute the negative sign for (2x-9), if you woud have distributed it then the equation would then be simplified into 6x-2x+9=31. You then add like terms and get 4x+9=31, subtract 9 on both sides and you'll get 4x=22. Divide 4 on both sides to isolate the variable and you get x=5.5

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