Function g is perpendicular to function f. Function fis represented by f(x) = x + 9 Two points that lie on function g are represented by (a + 3,5a + 6) and (2a + 6,7a + 2). What is the value of a?

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?