The step function f(x) is graphed. What is the value of f(0)? -2 -1 0 1

Answer: -2 is the correct answer
Explanation:
This is the graph for greatest integer function by looking at the graph we can clearly conclude that f at zero is giving the value -2
Greatest integer function gives the value that is less than or equal to the value taken inside the function
For example if we have 2.09 and is operating under greatest integer function the value comes out to be 2 because it will convert the decimal value in integer
denoted as [2.09]=2