Help in answering the following questions

Show that, under the assumptions of the two-state Markov model for mortality: var[D, - AV,] = ELD,] [6] The notation used here is the same as in the Core Reading, and you may assume that EID; - WV;] =0 (which is proved in Chapter 4 of the Course Notes).If new firms enter a perfectly competitive industry in the long run, attracted by supernormal profit, state the likely effect on: (a) the industry's supply (b) the market price (c) the level of profit earned by firms