complete the question by typing in the best answer please. I don't understand how to calculate this.

For the given piecewise function the value of x=6 would lie in the range
[tex]x\ge6[/tex]This implies we would make use of the function
[tex]f(x)=3[/tex]This further implies that for all x values greater than 5, f(x)=3
Therefore, the answer is 3