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OpenStudy (anonymous):
find the first term of the arithmetic sequence an = 48, Sn = 546, n = 26
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OpenStudy (anonymous):
an= a1+ (n-1)·d --> 48=a1+25·d Sn= (a1+an)·n/2 = 546 --> (a1+48)·13= 546 --> a1+48=42
OpenStudy (anonymous):
so its -6??
mathslover (mathslover):
yes ..
OpenStudy (anonymous):
thanks
mathslover (mathslover):
pleasure
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