isalybeaudion2205
12.08.2020 •
Mathematics
Find the sum of the first 30 terms in the sequence in #2. (Sequence is 16, 7, -2, …) Just need sum of first 30 solved :)
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Ответ:
The sequence is arithmetic, since the forward difference between consecutive terms is -9.
7 - 16 = -9
-2 - 7 = -9
etc.
This means the sequence has the formula
The sum of the first 30 terms is
Recall the formulas,
Then the sum we want is
Ответ:
Step-by-step explanation:
8 × 10000 + 0×1000 + 2× 100 + n + 6 x 1=0
80000 + 0 + 200 + n + 6 =0
80206n = 0
n = -80206