JayLiz1737
11.10.2019 •
Mathematics
The sum of the first 15 terms of the sequence an=10n+21
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Ответ:
the sum of all the terms from a1 to an when you are summing up n terms is n(a1+an)/2
so
find the 1st and 15th term
1st term is a1=10(1)=21=10+21=31
15th term is a15=10(15)+21=150+21=171
and n=15
15(31+171)/2=15(202)/2=3030/2=1515
the sum of the first 15 term is 1515
Ответ:
Simplify the equation
The simplified answer is
2x+17