Can someone please help me?! A middle school science teacher wants to conduct some experiments. There are 15 students in the class. The teacher selects the students randomly to work together in
groups of five.

a.
In how many ways can the teacher combine five of the students for the first
group if order is not important? (3 points)

b.
After the first group of five is selected, in how many ways can the teacher
combine five of the remaining students if order is not important? (3 points)

If lmn=xyz, which congruences are true by cpctc? check all that apply

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.

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.