The question is in French however the translation is below

4. Un virus se propage seton la fonction P() - 125(2)" ou P() est le nombre de personnes infectees au bout de { jours. a Combien de personnes etaient initialement infectees ? b) Combien de personnes sont infectees au bout de 4 semaines ? c) A quelle vitesse le virus se repand-il au bout de 4 semaines ? d) En combien de temps 22 500 personines se trouveront-elles infectees ?4. A virus spreads according to the function P() 5(2) on is the number of infected people after days. a) How many people were initially infected? b) How many people are infected after 4 weeks? C) How quickly does the virus spread after 4 weeks? d) How soon will 22,500 people become infected