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anonymous
 one year ago
Help please???
Find S7 for 3 + 8 + 13 + 18 +…
116
121
126
131
Thanks so much <3
anonymous
 one year ago
Help please??? Find S7 for 3 + 8 + 13 + 18 +… 116 121 126 131 Thanks so much <3

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Are you asking for the 7th term?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yes, the 7 is supposed to be a subscript not just next to it.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0To find a certain term in the sequence you can use the following \[S_n = \frac{ n }{ 2 }(a+t_n)\] where a is the first term, t_n is the following from sequences \[t_n = a+(n1) \times d\] where here a = first term, n is the term we are looking for and d = common difference.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Sorry that should say term in the "series" not sequence

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so the equation would be \[t _{n}=3+(n1)\times5\] ??

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Looks good, n is the term we are looking for :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0What am I supposed to do next? I tried working out the problem but I got 33 and that's not an option

anonymous
 one year ago
Best ResponseYou've already chosen the best response.033 is good! But note that we have to plug it into the first formula, at the moment you just found term 7 but not S7 \[t_7 = 33\]\[S_n = \frac{ n }{ 2 }(a+t_n)\] notice we plug in t_7 where it's t_n there are it's t_7 :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0okay so the equation 7/2(3+33)?
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