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.

Just to let you guys know, people thought the answer was C, but the correct answer was A. i don't know why it is A, please explain:(

Answer 1

A.

Explanation:

It's all down the the double parentheses. They mean 'round down to the nearest integer'. Also because of the 2 the integer will be even.

Answer 2

A real Even integers

Explanation: