Question

the 8th term of an arithmetic sequence is 12 and its 12th term is 8 what is the algebraic expression for the sequence and find its common difference and d​

Answer 1

Answer:

8th term = 12 = a + (8-1)d = a + 7d. This is equation 1. 12th term = 8 = a + (12-1)d = a + 11d. ... Therefore, algebraic expression for this sequence is nth term = 19 - (n-1) = 19 - n + 1 =20- n.