Radium-226 is a radioactive substance with an annual decay rate of 0.04 % . a series of coal mines in poland contain an abundance of the aforementioned isotope of radium. if these coal mines contained 400 thousand kilograms of radium-226 in 1937, then how much radium-226 would be left in those coal mines in 2017? round your answer to the nearest kilogram.

Find the balance at the end of 4 years if 1000 is deposited at the rate of

3382-299=3383- ? fill in the blank?

The number of chocolate chips in a bag of chocolate chip cookies is approximately normally distributed with a mean of 12611261 chips and a standard deviation of 118118 chips. (a) determine the 2626th percentile for the number of chocolate chips in a bag. (b) determine the number of chocolate chips in a bag that make up the middle 9696% of bags. (c) what is the interquartile range of the number of chocolate chips in a bag of chocolate chip cookies?