Question

The sum of the first 4 terms of an arithmetic sequence is 336 and the sum of the first 12 terms is 816.
a. Find the general term of the arithmetic sequence.
b. Find the sum from the 20th term to the 30th term.

I need it asap thank you for answering

Answer 1

Answer:

50° answer

Step-by-step explanation:

5x+6x+7x=180°

x=10°

Smallest angle=5x = 5*10= 50°

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