Toby rides his bike to school every day and to his best friend's house regularly. One week, he rode to and from school 5 times and to and from his best friend's house 3 times. He rode a total of 14.4 miles that week. The next week, he rode to and from school 4 times and to and from his best friend's house 6 times. He rode a total of 14.4 miles that week, too. This system of equations can be used to represent the situation:
5x+3y=14.4
4x+6y=14.4

You invested $5000 between two accounts paying 4% and 9% annual interest, respectively. if the total interest earned for theyear was $350, how much was invested at each rate? $was invested at 4% andwas invested at 9%.

Me 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.

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0