15 points! math- find an explicit rule for the nth term of a geometric sequence where the second and fifth terms are -36 and 2304, respectively. an = 9 • 4n an = 9 • (-4)n + 1 an = 9 • 4n - 1 an = 9 • (-4)n - 1

It's pretty easy to go through the choices and none has a[2]=-36 and a[5]=2304.  Something's probably wrong with the way the question is typed, but I will answer what's written.

Subtracting,

a[n] = -816 + 780(n-1)  which is none of the above

Check:

linear pair postulates

my guess would be b and d, but i didn’t actually get out the pen and paper. lol