Urchin tc yc you txutxurzyrxtuciyvuoxutxurx
<u>Answer:</u> The amount of sample left after 20 years is 288.522 g and after 50 years is 144.26 g
<u>Explanation:</u>
We are given a function that calculates the amount of sample remaining after 't' years, which is:

Putting values in above equation:


Hence, the amount of sample left after 20 years is 288.522 g
Putting values in above equation:


Hence, the amount of sample left after 50 years is 144.26 g
please have look at Periodic table , you will solve it yourself !
Yes, because cotton is a plant and then the cotton is then made into a ball of yarn.