Question

State the domain and range of the function f(x) =2[[x]]

A. reals Even integers. 
B. reals odd integers. 
C. reals all integers.
D. reals positive integers.

Answer 1

D. Real positive integers

Answer 2

answer is
C. reals all integers.

the range of the function f(x) =2[[x]] is all integers, include the set of all even, odd numbers, positive and negative and even 0