Talk to your parents or to another trusted adult about your health-related questions. Ask questions and insist on answers. Learn additional facts about how drug abuse puts your whole body at risk.
graph(Noun) An ordered pair , where is a set of elements called vertices (or nodes) and is a set of pairs of elements of , called edges; informally, a set of vertices together with a set edges that join these vertices.
in a project an activity is a task that must be performed and an event is a milestone marking the completion of one or more activities before an activity can begin all of its predecessor activities must be completed project network models represent activities and milestones by arcs and nodes pert originally was an activity on arc network in which the activities are represented on the lines and milestones on the nodes