Don't skip i need help as soon as possible and please hurry i will give 20 points + Brainliest

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 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?

Im literally having a mental breakdown