Question

For an arithmetic sequence, 9th term is 16 and its 16th term is 9

a) what is the common difference?​

Answer 1

Answer:

$t_{9} = 16 = a + 8d...(1)\\ t_{16} = 9 = a + 15d ...(2) \\ subtracting \: eq.(1) \: from \: eq.(2) \\ 7d = - 7\\ \\ d = - 1 \\ please \: mark \: as \: brainliest$