Question

The​ half-life of a radioactive substance is 28.1 years.
a. find the exponential decay model for this substance.
b. how long will it take a sample of 400 grams to decay to 300 ​grams?
c. how much of the sample of 400 grams will remain after 20 ​years?

Answer 1

Hopefully this will help you.

Answer 2

Answer:

In the blue area, people live closely because of its 1.Indutrialised area 2. The land is costly. 3.urbanisation In lighter color areas its farther because 1.Village 2.Farming area 3.Less popular rural area

Explanation:

In the blue area, people live closely because of its 1.Indutrialised area 2. The land is costly. 3.urbanisation In lighter color areas its farther because 1.Village 2.Farming area 3.Less popular rural area