Use the variation of parameters method to solve the de y"+y'- 2y=1

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?

Acd that is originally priced at $15.85 red-tagged for the sale. what is the sale price of the cd

Given the median qr and trapezoid mnpo what is the value of x?