Manuel2019
05.11.2019 •
Mathematics
Idon't know anything about this and obviously i suck at this lol
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Ответ:
Here and . So recursively, the sequence is defined by
is the sum of the first terms of the sequence. Before you can find this sum, an explicit formula for the would be useful. You have
and so on, up to
(Notice there's a pattern on the right hand side between the subscripted term and the coefficient of . They always add up to .)
So the explicit formula for this sequence is
You're asked to find the sum of the first 15 terms, which means
Now you could just find the first 9 terms and add them together, but that's more work than necessary. Instead, you have
There are some well known formulas for the sums of powers:
So you get
The answer is C.
Ответ:
38-10=28
Step-by-step explanation:
The angle labeled is x-10.
Since we know x is 38, subtract!
38-10=28
Mark brainliest please!