For the greeting in a business letter when you don't know the name of the person who will be reading it, which of the following is least likely to conform to present day usage

Email viruses are typically launched by people who modify header information to hide their identity. brightmail's enrique salem says that in the future, your email reader will authenticate the sender before putting hte message in your inbox. that way, you will know the source of all the emails you read. alan nugent of novell says, "i'm kind of a fan of eliminating anonymity if that is the price for security." will eliminating anonymity make computers more secure?

The returns on the common stock of maynard cosmetic specialties are quite cyclical. in a boom economy, the stock is expected to return 22 percent in comparison to 9 percent in a normal economy and a negative 14 percent in a recessionary period. the probability of a recession is 35 percent while the probability of a boom is 10 percent. what is the standard deviation of the returns on this stock?

How much are you willing to pay for a zero that matures in 10 years, has a face value of $1,000 and your required rate of return is 7%? round to the nearest cent. do not include a dollar sign in your answer. (i.e. if your answer is $432.51, then type 432.51 without $ sign)