[color=#134f5c][size=150]The sum, [b]u + v[/b], of two vectors, [b]u[/b] and [b]v[/b], is constructed by placing [b]u[/b], at some arbitrary location, and then placing [b]v [/b]such that [b]v[/b]'s tail point coincides with [b]u[/b]'s tip point, and [b]u + v [/b]is the vector that starts at [b]u[/b]'s tail point, and ends at [b]v[/b]'s tip point.[/size][/color]