What is the measure of angle abc

If 1 is divided by the sum of y& 4.the result is equal to 3 divided by 4, find the value of m

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

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?