So far 400 seats have been set up for a concert in the park. Space allows for 20 more rows of seats, with x seats in each row. Park rules say there must be fewer than 1000 people attending the concert. what is the solution of this inequality, and what is its meaning?

Use the elimination method to find the solution to the system of equations. 2x - 3y = -9 -x + 3y = 6

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.

Given the expression (7 ? 4i) ? (2 + 6i), perform the indicated operation and write the answer in the form a + bi.