False position method concerned with the questions of whether or not an approximation to a solution can be obtained, and if it can, how fast can the approximation be found. Two basic types of false position method can be distinguished historically, "simple false position" and "double false position". "Simple false position" is aimed at solving problems involving direct proportion. Such problems can be written algebraically in the form: determine such that if and are known. The method begins by using a test input value , and finding the corresponding output value by multiplication: . The correct answer is then found by proportional adjustment,
Midfielder mark specific opposition attackers. Defensive midfielders may also move to the full-back or centre-back positions if those players move forward to join in an attack. Sergio Busquets described his attitude: "The coach knows that I am an obedient player who likes to help out and if I have to run to the wing to cover someone's position, great." A good defensive midfielder needs good positional awareness, anticipation of opponent's play, marking, tackling, interceptions, passing and great stamina and strength (for their tackling). A holding or deep-lying midfielder stays close to their team's defence, while other midfielders may move forward to