Question

Find the 97th term of the arithmetic sequence -1,-12,-25

Answer 1

Answer:

$a_{97}$ = - 1247

Step-by-step explanation:

I think you copied the problem incorrectly.  The sequence as it stands is not  arithmetic.  Instead of the first term being -1, maybe it should be +1.  Then we have a common difference of -13.  So, that is what I will presume to be true.

The formula to use is

$a_{n} = a_{1} + (n - 1)d$

d = -13

$a_{97}$ = 1 + (97 - 1)(-13)

     = 1 + 96(-13)

     = 1 - 1248

     = - 1247