Six different airlines fly from new york to denver and seven fly from denver to dan francisco.

how many different pairs of airlines can you choose on which to book a trip from new york to san francisco via denver, when you pick an air line for the flight to denver and and air line for the continuation flight to san francisco?

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.

there is no grid

step-by-step explanation: