F(x)= {2ˆx, X<0

{-xˆ2 -4x +1, 0 2

  If x is less than 0, 2 to the power of that negative x will be 1/2^x.

So, 1/2^x.

Step-by-step explanation:

I can't go any further without more info about value of x.

step-by-step explanation:

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.