-163840
Explanation:
The formula to find the nth term for a geometric sequence is
(a1)(r)^n-1
So by plugging in the terms you get
(5)(-2)^16-1 = -163840
This is what I got I hope it helps
(6,-3) m=-3
formula is y=mx+c
substitute: -3= 3(6)+c
-3=-18+c (takeaway 18 from both sides)
-15=c
Rewrite equation in form y=mx+c
Therefore answer is y=-3x-15
I think this is how u do it from what I can remember :)