Question 253637
A radioactive substance has an initial mass of 100 grams and its mass halves every 4 years. Write an expression that shows the number of grams remaining after x years. 
--------------------------
A(t) = A(0)(1/2)^(t/4)
---------------
A(t) = 100(1/2)^(x/4)
===========================
Cheers,
Stan H.