Answer:
Domain of given function f(x) is all real number.
A is correct.
Step-by-step explanation:
We are given an exponential function.
[tex]f(x)=-\dfrac{5}{6}\cdot\left (\dfrac{3}{5}\right)^x[/tex]
Domain is a input value of x where function is defined. It is exponential function defined everywhere. Therefore, Domain of exponential function is all real number.
Domain in interval form:
[tex]x\epsilon (-\infty,\infty)[/tex]
Thus, Domain of given function f(x) is all real number.
