Perform the indicated operations. (3a+8)^2

What is the quotient of 42/3 divided by 4 1/5

Rewrite the hyperbolic equation 4y^2 -9x^2 +54x-8y-113=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?