Is asia east of the us or west of the us?

Compare demographic and environmental effects of the columbian

Distance that the transcontinental railroad covered from omaha to san francisco.

Brian's school locker has a three-digit combination lock that can be set using the numbers 5 to 9 (including 5 and 9), without repeating a number. the probability that the locker code begins with a prime number is %. the probability that the last digit of the locker code is an odd number is %.