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anonymous
 one year ago
what is a summation notation for the series?
a. 5 +2+9+16+...+261+268
b. 500+490+480+...+20+10
anonymous
 one year ago
what is a summation notation for the series? a. 5 +2+9+16+...+261+268 b. 500+490+480+...+20+10

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i have no idea on how to do this

Jhannybean
 one year ago
Best ResponseYou've already chosen the best response.1Iwould start with b, seems a bit easier.

Jhannybean
 one year ago
Best ResponseYou've already chosen the best response.1This is what you call an arithmetic sequence, where you have a common `difference` between the numbers in a sequence. Can you spot what the difference is?

Jhannybean
 one year ago
Best ResponseYou've already chosen the best response.1I've got to head off for a bit, I'll get someone on to help you @Michele_Laino please? Thank you !

Mehek14
 one year ago
Best ResponseYou've already chosen the best response.1yes it does decrease by 10 each time

Loser66
 one year ago
Best ResponseYou've already chosen the best response.1For a) \(a_2= a_1+7\\a_3= a_2+7= a_1+2*7\\a_4=a_3+7 = a_1+3*7\\\\a_n= a_1+(n1)7\)

Loser66
 one year ago
Best ResponseYou've already chosen the best response.1Now, calculate the last term: \(268 = a_1 +(n1) 7=5 +(n1) *7\) solve for n, you have n= 40 Hence the summation is \[\sum_{n=1}^{40} 5+7(n1)\]

Loser66
 one year ago
Best ResponseYou've already chosen the best response.1Imitate the same process to get the answer for b) instead of +7, you do 10
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