I need help for question 9 & 10

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

Need now max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.

The difference of two numbers is 40. find the numbers if 0.3 parts of one number is equal to 37.5% of the other one.