Factor -4.3 out of 12.9b - 21.5

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

How many kilometers are equal to 5 miles? use 1 mile ≈ 1.61 kilometers. !

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?