Answer:
A,D and E
Explanation:
We are given that a function

The given function is exponential function .
The exponential function is defined for all real values of x.
Therefore, domain of f=Set of all real numbers
Substitute x=0

Range of f is greater than 0.
x=1

x=2

As x increases by 1, each value of y is one-seventh of the previous y-value.
Therefore, option A,D and E are true.