matrix and graph math discret

In a university 3 buildings (block A, B, C) have different pedestrian bridges on different floors of the buildings, which allow a person to move from one block to another without having to go down to the first floor. I Build the incidence matrix for this situation Construct a graph to illustrate the layout of building bridges. H The airline Discreta has air routes for each day. These are: four flights from Boston to Newark; two flights from Newark to Boston; three flights from Newark to Miami; two flights from Miami to Newark; a flight from Newark to Detroit; two flights from Detroit to Newark; three flights from Newark to Washington; two flights from Washington to Newark, and one flight from Washington to Miami. Create a directed graph depicting air routes