Question

find 16th term of an ap -1,-5,-9

Answer 1

Hey.. I think this can be ur answer!!

a=-1
d=-5+1 =-4
Now,
T16= a+15d = - 1 +15(-4) =-1 - 60 =-61

Hope it helps you dear ☺️☺️

Answer 2

the 16th term of the AP is 

an=a+(n-1)d
a16 = -1 + (16-1)-4
       = -61

hope it helps !!