The half-life of radium is 1690 years. if 50 grams are present now, how much will be present in 760 years?

Someone answer asap for ! 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.

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.

When i'm with my factor 5, my prodect is 20 .when i'm with my addend 6' my sum is 10.what number am i