Question

experiments show that radium disintegrates at a rate proportional to the amount of radium present at the moment . if half life is 1590 years what percentage will disappear in one year?

Answer 1

A(t)=Ao*(1/2)^(t/1590)

A(t)/Ao=.5^1/1590 =
put this in the google search window:
.5^1/1590 =

Answer 2

You will probably like the answer better if you enter .5^(1/1590) ...