Question

Can some one help me find the domain and range of
1) f(x) = [[x]]-1
2) f(x) = |2x|
3) h(x) = |-x|
4) g(x) = |x| + 3

Answer 1

Domain of all four functions is {all real numbers}

Range of functions 2 is [0, +infinity)

Range of function 3 is (-infinity, 0]

Range of function 4 is [3, +infinity)

Range of the greatest integer function (num. 1) is {the integers}