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Nata [24]
3 years ago
11

I think of a number add 1 then double the results help for my mate

Mathematics
2 answers:
zalisa [80]3 years ago
5 0
18 what is this for exactly..?
IRINA_888 [86]3 years ago
3 0
Let’s call the number x, this would be your equation: (x + 1) * 2

so if the number you are thinking of is 10, for example, the solution would look like this:

(x + 1) * 2
(10 + 1) * 2
11 * 2
=5.5
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Write the series using summation notation.<br><br> 4 + 8 + 12 + 16 + 20+ . . . + 80
zhannawk [14.2K]

Answer:

\sum ^{20} _{n \to \11} 4n

Step-by-step explanation:

In order to write the series using the summation notation, first we need to find the nth term of the sequence formed. The sequence generated by the series is an arithmetic sequence as shown;

4, 8, 12, 16, 20...80

The nth term of an arithmetic sequence is expressed as Tn = a +(n-1)d

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Since the last term is 80, L = 4n

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This shows that the total number of terms in the sequence is 20

According to the series given 4 + 8 + 12 + 16 + 20+ . . . + 80 , we are to take the sum of the first 20terms of the sequence. Using summation notation;

4 + 8 + 12 + 16 + 20+ . . . + 80  = \sum ^{20} _{n \to \11} 4n

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3 years ago
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melisa1 [442]
I believe that you are correct.
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Levart [38]

Answer:

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