Er Coaster Speeds in North America (miles/hour) Roller Coaster Speeds in Asia (miles/hour) 128 149.1 120 106.9 100 95 93 83 92 80.8 90 80.3 85 78.3 82 71.5 80 69.6 77 68.4 The difference of the means of the two data sets is 10.45 . The mean absolute deviation of the roller coaster speeds in North America is . The mean absolute deviation of the roller coaster speeds in Asia is .

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.

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

answer: it's d

step-by-step explanation: