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storchak [24]
2 years ago
15

PLZ HELP if you dont know just dont answer i will give brainliest if you answer right

Mathematics
1 answer:
marta [7]2 years ago
6 0

Answer:  The answer for 1. is 216

The answer for 2. is 224

The answer for 3. is 90

The answer for 4. is 40

The answer for 5. should be 80

Step-by-step explanation:

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Help answering this simple Series Question? I don't know what I did wrong!
Tatiana [17]
Looks like you just evaluated the summand for the given value of n, whereas the question is asking you to find the value of the sum for the first n terms.

Let S_k=\displaystyle\sum_{n=1}^k\frac3{(-2)^n}. Then S_k is the kth partial sum.

S_1 happens to be the first term in the series, which is why that box is marked correct:

S_1=\displaystyle\sum_{n=1}^1\frac3{(-2)^n}=\frac3{(-2)^1}=-1.5

But the next partial sum is not correct:

S_2=\displaystyle\sum_{n=1}^2\frac3{(-2)^n}=\frac3{(-2)^1}+\frac3{(-2)^2}=-0.75

and this is not the same notion as the second term (which indeed is 0.75) in the series.
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3 years ago
What is the value of x?
Vaselesa [24]

In a right triangle, the hypotenuse is √2 x the legs. In this case, the value of x is \frac{18}{\sqrt{2} } =\frac{18\sqrt{2} }{2} =9\sqrt{2}.

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2 years ago
12
LenaWriter [7]

Answer:

2159.74

Step-by-step explanation:

you times 456 by 4 then you times that answer by the 1742%

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astra-53 [7]

question is wrong sir

there is no any value with two points

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