Question

The 3rd and 6th term of an arithmetic sequence are 13 and 25 respectively. (a) What is its common difference? (b) What is its 15th term?​

Answer 1

Answer:

Let first term be a and d be the common difference

3rd term =a+2d=13

6th term =a+5d=−5

3d=−5−13=−18

d=−6,a=25

11th term =a+10d=25−60=−35

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Answer 2

Answer:

Let first term be a and d be the common difference

3rd term =a+2d=13

6th term=a+5d=-5

3d=-5-13--18

d=-6,a=25

11th term=a+10d=25-60=-35