Please answer this question ASAP

Consider the following game, where x>0 Player 1 Aim right Aim left Dive right 140,140 20,160 Player 2 Dive left 90+x,9o-x 50,50 a) What is the difference between a dominant strategy and a dominated strategy? Why would a player in a game be unlikely to choose a dominated strategy? b)for what values of x do both players have a dominant strategy? What is the Nash equilibrium? c) Are there any values of x such that only one player have a dominant strategy