Answer Happy

Question 15 (2 points) In Great Britain, intersections are arranged in a roundabout, as indicated in the figure below. We suppose that the traffic follows the direction of the arrows. The intersections are labelled by A,B,C,D,E and F. The number of cars going along each road segment is indicated by the numbers and the variables 21, 22, 23, 24, 25, 26 120 150 1 X4 13 B 80 100 +100 F What is the equation for the traffic flow at intersection C, and what are the constraints on the variables?
a) 34 - 35 = -150; the Iį are strictly positive integers Ob) 24 - 25 = 120; the Xi are integers, positive or zero. c) X2 - X3 = 120; the X, are integers, either positive or zero. d) 23-24 120; the ci are integers, either positive or zero. 23 + 24 = 120; + x4 the 21 are real numbers, either positive or zero. f) 23 - 24 = -120; the ci are real numbers, either positive or zero.