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Mademuasel [1]
2 years ago
12

The sum of the first 15 terms of the sequence an=10n+21

Mathematics
1 answer:
enot [183]2 years ago
3 0
That is
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
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Answer:

Step-by-step explanation:

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Step-by-step explanation:

Given:

Length of lake = 5.651 mi

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