1. Find the 18th term of the sequence 1, 6, 11, 16, …
2. Which term in the arithmetic sequence 5, 11, 17, 23, … is 125?
3. The 3rd term of an arithmetic sequence is 58 and the 10th term is 30. Find a1, d and the nth term.
4. Find the terms between 6 and 34. 6, __ , __ , __, 34
5. What is the sum of the odd integers from 1 to 200?
I'll mark BRANLIEST Who can anwer it clearly and Satisfied.
Thanks.
2. Which term in the arithmetic sequence 5, 11, 17, 23, … is 125?
3. The 3rd term of an arithmetic sequence is 58 and the 10th term is 30. Find a1, d and the nth term.
4. Find the terms between 6 and 34. 6, __ , __ , __, 34
5. What is the sum of the odd integers from 1 to 200?
I'll mark BRANLIEST Who can anwer it clearly and Satisfied.
Thanks.
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Step-by-step explanation:
1.
formula:
Sn = n/2 ( 2a + (n-1)d)
Sn = 18/2 ( 2(1) + (18-1) 5)
= 9 ( 2 + (17) 5)
= 9 ( 2 + 85)
= 9 ( 87)
S18 = 783
2. 21st term
3 .
a = 66
d = -4
an = 66 + (n-1) -4 (not so sure abt this)
4. 13, 20, 27
5. 9950