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2 years ago

Find the 9th term of the geometric sequence show below -9x^4,27x^5,-81x^6

Mathematics

1 answer:

Anna11 [10]2 years ago

5 0

Answer:

Scale factor is -3

so,

243x^7

-729x^8

2187^9

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babymother [125]

Answer:

Step-by-step explanation:

do the parentheses first to get 4

8/2 x 4

4 x 4

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1 year ago

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Item 2

astra-53 [7]

Answer:

a = 25

r = 20%

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2 years ago

3(7x+4)-x as an infinite equation

Sidana [21]

Answer: 20x+12

Step-by-step explanation:

Distribute the three: 3(7x+4) will be changed to 21x+12-x

Next group like terms, -x+21x=20x

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2 years ago

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Can someone please help with this math question:)

Bingel [31]

Solution:

The rationalisation factor for $\frac{1}{ a - \sqrt{b} }$ is $a + \sqrt{b}$

So, let us apply it here.

$\frac{1}{5 - \sqrt{2} }$

The rationalising factor for 5 - √2 is 5 + √2.

Therefore, multiplying and dividing by 5 + √2, we have

$= \frac{1}{5 - \sqrt{2} } \times \frac{5 + \sqrt{2} }{5 + \sqrt{2} } \\ = \frac{5 + \sqrt{2} }{(5 - \sqrt{2})(5 + \sqrt{2} ) } \\ = \frac{5 + \sqrt{2} }{ {(5)}^{2} - ( \sqrt{2})^{2} } \\ = \frac{5 + \sqrt{2} }{25 - 2} \\ = \frac{5 + \sqrt{2} }{23}$

Answer:

$\frac{5 + \sqrt{2} }{23}$

Hope you could understand.

If you have any query, feel free to ask.

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Ilya [14]

Answer:

I'm pretty sure it's 0.257!

Step-by-step explanation:

Sorry if I got it wrong I'm trying my best hope you have a great day!!

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