Which number produces an irrational number when added to 1/3 answer

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

What is the value of x in the following equation. -x ^3/2 = -27

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.