Question

•The sum of 1st and 21st term of an arithmetic sequence is 140.

a) What's the 11th term?
b) Write the sequence if the first term is 10.
c) calculate the sum of the 1st 11 terms of this sequence.
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Answer 1

Answer:

a) . $t_{11}$ = 70 , b). a=10 ,d =6 , 10,16,22,.... (c). $S_{11}$ = 440

Step-by-step explanation:

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Answer 2

Answer:

Calculate the term of this sequence