Answer:
B. x ∈ R
all real numbers.
Explanation:
Domain deals with x values, range is y values. So you can cancel out A.
lets graph it,
go to
Desmos. com and type in
f(x)=14(0.8)^x
(you can copy and paste what I typed)
x just keeps going
it doesn't have restraints. and the line never ends. (there isn't an asymptote- a point that the line approaches but never touches)
so x or the domain is all real numbers
x ∈ R
:)