Exponential functions: A certain substance decays so that ea

[coolchic624]

A certain substance decays so that each year 90% of the previous year's material is still present. How much of an initial 2 kilograms of material would remain after 1, 2, and 3 years?

 

[stapel]

What is 90% of 2?

What is 90% of 90% of 2?

What is 90% of 90% of 90% of 2?

Eliz.