Detroit, michigan covers an area of 142.9 square miles. there are approximately 672,800 people living in detroit. grand rapids, michigan has an area of 45.3 square miles and has a population of approximately 195,100 people. how many more people, per square mile, live in detroit verses grand rapids? round to the nearest person per square mil

Peter applied to an accounting firm and a consulting firm. he knows that 30% of similarly qualified applicants receive job offers from the accounting firm, while only 20% of similarly qualified applicants receive job offers from the consulting firm. assume that receiving an offer from one firm is independent of receiving an offer from the other. what is the probability that both firms offer peter a job?