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Elden [556K]
2 years ago
13

the sum of the 10th and 11th terms of an arithmetic sequence is 65 what is the sum of its first 20th terms​

Mathematics
1 answer:
Dmitriy789 [7]2 years ago
6 0

Answer:

this is the answer

Step-by-step explanation:

a 65

b 650

c 52

d 3

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3 years ago
The olympics are held every four years. In 2016, the XXXI olympiad were held in Rio de Janeiro,Brazil. Determine the year of the
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Answer:

First Olympic held in year 1896.

Step-by-step explanation:

Number of Olympiad held in Rio = XXXI = 31st

Difference of years in two consecutive Olympiads = 4 years

Number of years spent in 31 Olympiads can be calculated by,

Number of years spent = (n - 1)d

Here n = number of Olympiads held

d = difference between two consecutive Olympiads

Number of years spent till 31st Olympiads = (31 - 1)×4

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Therefore, 1st Olympiad held in the year = 2016 - 120

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2 years ago
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Step-by-step explanation:

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