Jill and Abhasra are selling wrapping paper for a school fundraiser. Customers can buy rolls of plain wrapping paper and rolls of holiday wrapping paper. Jill sold 5 rolls of plain wrapping paper and 3 rolls of holiday wrapping paper for a total of $69. Abhasra sold 3 rolls of plain wrapping paper and 3 rolls of holiday wrapping paper for a total of $57. What is the cost of one roll of plain wrapping paper and one roll of holiday wrapping paper?

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.)