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kow [346]
3 years ago
12

So I have to finish this and I have no idea How to do it. Please Help.

Mathematics
1 answer:
Zina [86]3 years ago
8 0

Answer:

25 bc I mena I did count the scares but then I took the ones that weren’t fully squares and counted them as a quarter and that’s what I got not sure don’t trust meh bc I just guess this

Step-by-step explanation:

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Write the series using summation notation.<br><br> 4 + 8 + 12 + 16 + 20+ . . . + 80
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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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d is the common difference = 21-8 = 8-4 = 4

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On substituting, Tn = 4+(n-1)4

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Since the last term is 80, L = 4n

80 = 4n

n = 80/4

n = 20

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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