Factor 16x4 - 4y2

A) (x + 4y)(x - 4y)
B) 4(2x2 + y)(2x2 - y)

What is the measure of x, in degrees

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

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?