If n + 10 = 45.5, then what is the value of the expression n - 25?

  10.5

Step-by-step explanation:

Subtract 35 from the given equation:

  n + 10 - 35 = 45.5 - 35

  n - 25 = 10.5

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.