A stadium has 20,000 seats, divided into box seats, lower-deck seats, and upper-deck seats. Box seats sell for $10, lower-deck seats sell for $8, and upper-deck seats sell for $5. When all the seats for a game are sold, the total revenue is $140,000. The stadium has four times as many upper-deck seats as box seats. Find the number of lower-deck seats, upper-deck and box seats in the stadium.

step-by-step explanation:

the first 5 right here the next 5 i will upload as separate question

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.