Our galaxy, the Milky Way, has a diameter of about 1 x 10^21 meters. The largest galaxy known to man, the IC 1101, has a diameter of 5 x 10^22 meters. The diameters of the IC 1101 is about how many times greater than the diameters of the Milky Way?

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?

How do you write something in scientific notation?

Precalculus question, image attached.