Question

Arithmetic or geometric

Answer 1

Step-by-step explanation:

the first one is Geometric​:  

r=9/-3=-27/9 =81/-27=-3

a(n)=-3*(-3)^(n-1)

the second one is Geometric​:  

r=4/1=16/4=64/16=4

a(n)=1*(4)^(n-1)

hope this helps