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Write the sum using summation notation, assuming the suggested pattern continues.
9  4 + 1 + 6 + ... + 66



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@whpalmer4

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@Reaper534

Reaper534
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ohh thats easy it adds by 5

Reaper534
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so 11 16 21 26 31 ect.

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so is it 9+5n

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\[\sum_{n=0}^{15} (9+5n)\]

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@Reaper534

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tht will be the best choice

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thank you can you also help me in this problem

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Find the sum of the first 9 terms of the sequence. Show all work for full credit.
2, 7, 16, 25, ...

Reaper534
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29=78=16... so u subtract by 9 im alo in school right now too i need to get back at that lol

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lol thank you so i just subtract 169

Reaper534
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yeah u do u start from 2 or 25?

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alright so 29, 79, 169, 259 and i will have my answer

Reaper534
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29=7,...

Reaper534
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ok gtg to my paper

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79= 16, 169=259=34... and so on

Reaper534
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correct

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an i do this unitl i get to the ninth term

Reaper534
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ok there u go now i relly gtg

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ight thanks