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Salsk061 [2.6K]
3 years ago
6

Look at the pic and help if you can thxxxx

Mathematics
1 answer:
givi [52]3 years ago
6 0

Answer:

The 1,3,and 4.

Step-by-step explanation:

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Determine the sum of the arithmetic series: 5+18 +31 +44 + ... 161.
Finger [1]

Answer:

1079

Step-by-step explanation:

Hello,

18-5 = 13

31-18=13

44-31=13

161=5+13*12

So we need to compute

\displaystyle \sum_{k=0}^{k=12} \ {(5+13k)}\\\\=\sum_{k=0}^{k=12} \ {(5)} + 13\sum_{k=1}^{k=12} \ {(k)}\\\\=13*5+13*\dfrac{12*13}{2}\\\\=65+13*13*6\\\\=65+1014\\\\=1079

Thanks

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What’s the sum of 20x^2-10x-30
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IrinaK [193]
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2 years ago
I need help I will give 100 points and brainliest
Anit [1.1K]

Answer:

5. 9/2 6. 9/4 7. 7/2 8. 8/3 9. 2/3

Step-by-step explanation:

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