PLEASE HELP ASAP

Which statement shows how the product of (x + 7)2 demonstrates the closure property of multiplication?
A: x2 + 14x + 49 is a polynomial
B: x2 + 14x + 49 may or may not be a polynomial
C: x2 + 49 is a polynomial
D: x2 + 49 may or may not be a polynomial

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.

The table shows the number of students who signed up for different after school activities. activity students cooking 9 chess 4 photography 8 robotics 11 select the true statements about the information in the table.

An object in geometry with no width, length or height is a(n):