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Mandarinka [93]
3 years ago
15

Find the sum of 3+9+27...+6561

Mathematics
1 answer:
Nikolay [14]3 years ago
7 0
The sum of the first n terms of a geometric series with first term a₁ and common ratio r is given by the formula
S_{n}=a_{1}\cdot\dfrac{r^{n}-1}{r-1}

Then your sum is
\sum\limits_{n=1}^{8}3^{n}=3\cdot\dfrac{3^{8}-1}{3-1}=9840

The sum of this geometric series with first term 3 and common ratio 3 is ...
   J  9840
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Help math plz! Giving brainlist :D
adoni [48]
No, there is not common ratio...

0.972  (common ratio is 0.3...10.8*.3*.3)

you can use the geometric mean to find this center value easily...

(18*8)^(1/2)=12
7 0
3 years ago
BRAINLIST
777dan777 [17]
Answer:

Naomi must buy a minimum of 5 blocks of cream cheese.


Explanation:

2.75 pounds = 44 ounces

44 oz divided by 8 oz (per block) =
5.5 blocks of cream cheese

She already has 4 oz of cream cheese so subtract 1/2 block of cream cheese.

She needs to buy at least 5 blocks.


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3 years ago
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What is the inverse of the function f(x) = x +3?
jekas [21]
F(x)=x-3 I think but I am not sure
3 0
3 years ago
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How many centimeters are in a meter?how many millimeters are in a meter?
Andreas93 [3]

Answer:

100 centimeters are in a meter. 1000 millimeters are in a meter.

Please mark brainliest :)

7 0
3 years ago
What is the measure of Zc<br>​
maks197457 [2]

Answer: 56 degrees

Step-by-step explanation:

We know that angle between b and c is 90 degrees. Because there is a line dividing angles a and b from 124 and c, we also know that each side is 180 degrees (a and b add to 180, and 124 and c add to 180).

124 and c are supplementary angles. We can represent this in an equation to solve for c:

124 + c = 180\\\\c = 56

3 0
3 years ago
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