Extracted text: Water is flowing through a network of pipes (in thousands of cubic meters per hour), as shown in the figure. (Assume F1 = 600 and F2 = 300. If the system has an infinite number of solutions, express x1, X2, X3, X4, X5, X6, and x7 in terms of the parameters s and t.) F2 X3 | X4 X5 F2 X6 X7 (a) Solve this system for the water flow represented by xj, i = 1, 2, . . ., 7. (Х1, X2, Х3, х4, X5, X6, X7) %3D (b) Find the water flow when x1 = x2 = 250. (X1, X2, Хз, Х4, X5, X6, X7) %3 (c) Find the water flow when x6 = X7 = 0. (X1, X2, X3, X4, X5, X6, X7) = (d) Find the water flow when x5 = 1000 and x6 = 0. (Х1, X2, Хз, Х4, X5, X6, X7) %3D