The half-life of thorium-227 is 18.72 days. how many days are required for three-fourths of a given amount to decay?
i'm not quite sure how to set it up to even start working it? would be appreciated!

Imagine that you’re getting ready to move to a new city. when people move, they are influenced by push factors and pull factors, and you have many reasons for your move. which of the following factors is an example of a pull factor? a. wanting to move because you’ve found a great new school somewhere new b. needing to move because there are not enough resources in your old hometown c. being forced to move because your old home is gone d. having to move because there are no jobs in your current hometown

What is the volume of the fluid in the graduated cylinder with accuracy and measured to the correct degree of precision? 41.2 ml 42.0 ml 41.23 ml 41.89 ml

How have the greenhouse gasses increased from the year 2000 to 2018