Question 155607
The notation [x] simply tells us that if "x" an decimal number like 2.5, then simply [x] will be the largest integer (whole number) that is less than "x"



So if x=2.5, then -[2.5]=-(2)=-2



If x=3.5, then -[3.5]=-(3)=-3



and if x=4.5, then -[4.5]=-(4)=-4



This works with negative numbers as well. If x=-2.5, then -[-2.5]=-(-3)=3




So the graph of y=-[x] is simply a collection of horizontal lines like this:




<img src="http://i150.photobucket.com/albums/s91/jim_thompson5910/ben%20bongo/problem3a.jpg" alt="Photobucket - Video and Image Hosting"> Graph of y = -[x]




Notice how if {{{x=2.5}}}, then {{{f(x)=-2}}}, if {{{x=3.5}}}, then {{{f(x)=-3}}}, etc.