Graph the first six terms of a sequence where a = -10 and d = 3.
+
+
{(1, -10), (2, -7), (3,-4), (4, -1), (5,2), (6,5)}
0
+
+

your answer would be 10x - 1

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.