You and your friend are selling magazine subscriptions for a fundraiser. After w weeks, you have sold (3w+4)
subscriptions and your friend has sold (5w+1)
subscriptions.

a. Write an expression in simplest form that represents the difference between the number of subscriptions your friend has sold and the number you have sold.
An expression is 2w−3.

b. After 5 weeks, your friend has sold more subscriptions than you.

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?