How much is a chicken leg plus a chicken leg HMHMHM?

Which of the binomials below is a factor of this trinominal? x^2-13+30

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

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?