Is the number rational or irrational?
column a column b
1. 3/7 a. rational
2. 0.78( repeating) b. irrational
3. square root 7/9
4. 5 pi

Don't know how to find x given these segment lengths

It says factor each expression completely 8y+48

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?