Part a: bill earned $12 walking his neighbors' dogs on saturday. he earned some extra money on sunday doing the same thing. write an expression with a variable that shows the total amount of money bill earned saturday and sunday. part b: bill was able to walk 2 more than twice as many dogs as his friend steve. write an algebraic expression to represent the number of dogs bill walked compared with steve.

Needmax 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.