If using the method of completing the square to solve the quadratic equation x^2+8x+37=0, which number would have to be added to "complete the square"? (DeltaMath and is supposed to be a fraction or decimal)

Find the roots of the equation below. x^2 - 6 + 9 = 0

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?

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?