Afarmer has 100 gallons of 70% pure disinfectant. he wishes to mix it with disinfectant which is 90% pure in order to obtain 75% pure disinfectant. how much of the 90% pure disinfectant must he use?

What is the binomial expansion of (2x-3)^5

What is the slope of the line passing through the points (-5, 7) and (-3,5)?

An oil exploration company currently has two active projects, one in asia and the other in europe. let a be the event that the asian project is successful and b be the event that the european project is successful. suppose that a and b are independent events with p(a) = 0.2 and p(b) = 0.8. (a) if the asian project is not successful, what is the probability that the european project is also not successful? (b) what is the probability that at least one of the two projects will be successful? (c) given that at least one of the two projects is successful, what is the probability that only the asian project is successful? (round your answer to three decimal places.)