The sum of the first 10 terms of an arithmetic sequence is 380.If a1 = 18, what is
the last term?
gawin kong brainlest pagmay solution.
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The sum of the first 10 terms of an arithmetic sequence is 380.If a1 = 18, what is
the last term?
gawin kong brainlest pagmay solution.
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Answer:
a10=58
Step-by-step explanation:
Sn=n/2 (a1+an)
380=10/2 (18+an)
380=5 (18+an)
380=90+5an
380-90=5an
290=5an (divide both sides by 5)
an=58