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Saiyan
 one year ago
Help I don' t understand how to do this question! I will give medals
Saiyan
 one year ago
Help I don' t understand how to do this question! I will give medals

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IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.1\(S = 4 + 3 + 2 + .... + \ (14) + \ (15)\) but reverse it and: \(S = (15) + (14) + ... + \ 3 + \ 4\) so \(2S = S + S = \ ...???\)

IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.115 + 4 = 11 14 + 3 = 11 etc etc

Saiyan
 one year ago
Best ResponseYou've already chosen the best response.0yeah i tried that and i got 130

Saiyan
 one year ago
Best ResponseYou've already chosen the best response.04+3+2+1+012345678910111213141516

jdoe0001
 one year ago
Best ResponseYou've already chosen the best response.0@Saiyan what would be the 1st term in the sequence?

IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.1130 !!! you have 20 terms in the sequence, right?!?! as you're summing from n = 1 to 20

IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.1continue with this and you will get there

jdoe0001
 one year ago
Best ResponseYou've already chosen the best response.0well, is a sequence , notice \(\large \bf \sum\limits_{n=1}^{20}\quad (5n)\qquad thus\qquad a_1=?\)

jdoe0001
 one year ago
Best ResponseYou've already chosen the best response.0\(\large a_1=first\ term=?\)

jdoe0001
 one year ago
Best ResponseYou've already chosen the best response.0\(\large \begin{array}{llll} \sum\limits_{{\color{brown}{ n=1}}}^{20}\\ \ \uparrow \\ hint \end{array}\)

IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.1so that's 20 x (11) / 2 yes?

jdoe0001
 one year ago
Best ResponseYou've already chosen the best response.0ahemmm using \(\large S_n=\cfrac{n}{2}(a_1+a_n)\) yes
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