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blagie [28]
3 years ago
12

HELP PLEASE ITS URGENT

Mathematics
2 answers:
Licemer1 [7]3 years ago
3 0

Answer:

21

Step-by-step explanation:

7x3=21

21/3=7

you just have to use inverse operations

(: hope this helps

madam [21]3 years ago
3 0

Answer:

21

Step-by-step explanation:

because I have a playstation

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Which expression is equivalent to 60 Σ n=1 (2n − 1)2 ? Check all that apply.
Hunter-Best [27]

9514 1404 393

Answer:

  B, D

Step-by-step explanation:

The quadratic expands to ...

  (2n -1)² = (2n)² +2(2n)(-1) +(-1)² = 4n² -4n +1

The coefficients can be factored out of the sum, so ...

  ∑(4n²) = 4∑n² for example

The sum of 60 ones is 60:

  \displaystyle\sum_{n=1}^{60}{1}=1+1+1+\dots+1=60

So, the sum can be written as ...

  \displaystyle\sum_{n=1}^{60}{(2n-1)^2}\\\\=\boxed{4\sum_{n=1}^{60}{n^2}-4\sum_{n=1}^{60}{n}+\sum_{n=1}^{60}{1}}\\\\=\boxed{4\sum_{n=1}^{60}{n^2}-4\sum_{n=1}^{60}{n}+60}

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It appears that the key to choosing the correct answers is paying attention to signs.

7 0
3 years ago
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Which one is it? Please help
nevsk [136]

Answer:

D

Step-by-step explanation:

I just did it and got it right

6 0
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Find the sum of the first 7 terms for the geometric series for 1/3+1+3+9+...
Kitty [74]
I think it is
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7 0
3 years ago
Vicki and Tamra are working on their math homework together. Vicki has worked p problems, and Tamra has worked 4 times as many p
Marrrta [24]

Answer: 6

Step-by-step explanation:

5 0
4 years ago
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I need help please?!!!
Anvisha [2.4K]

Answer:

53

Step-by-step explanation:

You add up how far away each number is from 0 on the number line. 10 is 10 away from 0, -43 is 43 away from 0. 10 + 43 = 53

7 0
3 years ago
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