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OpenStudy (anonymous):
please help thanks
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OpenStudy (triciaal):
you are welcome now post the question
OpenStudy (anonymous):
lol
OpenStudy (anonymous):
OpenStudy (anonymous):
sorry lol i couldnt find the pic
OpenStudy (anonymous):
do you have answer choices
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OpenStudy (anonymous):
no
OpenStudy (anonymous):
:(
OpenStudy (anonymous):
@welshfella
OpenStudy (welshfella):
that's the sum of the first 25 terms for the sequence which is arithmetic:- the formula for n terms is Sn = (n/2)[2a1 + d(n - 1)]
OpenStudy (welshfella):
- where a1 = first term and d = common difference
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OpenStudy (welshfella):
here n = 25 , a1 = -7 and d = 5
OpenStudy (anonymous):
1325?
OpenStudy (anonymous):
@welshfella
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