For the simple harmonic motion equation d=8 sin(4 pi t) , what is the period? if necessary, use the slash (/) to represent a fraction

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?

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1