Question

27.
The sum of first and 21st terms of an arithmetic sequence is 140.
(a)
What is the 11th term ?
Write the sequence, if the first term is 10.
(c) Calculate the sum of first 11 terms of this sequence.
Find the sum of first 11 terms of the sequence 20, 25, 30, .....
(b)​

Answer 1

Answer:

21 term phone XL matrix with equal 11th term 10 sequence and 15 the term 28.2

Answer 2

Hope this answers the question