PLEASE HELP ANSWER ALL THREE PARTS OF THE QUESTION. VERY CONFUSED

Question

GRAPH EACH FUNCTION. STATE THE DOMAIN AND RANGE.
Part A:
1) f(x) =[[x]] + 4
2) f(x) =|-x+2|
3) f(x) =-2x +3 if x > 0
             1/2x - 1 if x ≤ 0

Answer 1

This question was answered when another student (Yuan) submitted it.  Look there!