Select the property of equality used to arrive at the conclusion.
if 1/3x=5, then x=15
a. the multiplication property of equality.
b. the addition property of equality.
c. the subtraction property of equality.

Can someone me and do the problem plz so i can understand it more better

What is the perimeter of a rectangular building that is 80 feet wide and 140 feet deep?

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.