Find the value of x.

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?

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83