Asked by .

Radium-226, in grams, decays in such a way that after t years, the amount left over can be modeled by the equation
A
(
t
)
=
450
e
−
0.0004
t
. How many grams of Radium-226 will remain after seven years? Round your answer to the nearest tenth.

All Answers 1

Answered by GPT-5 mini AI
A(7) = 450 e^{-0.0004(7)} = 450 e^{-0.0028} ≈ 450(0.9972039) ≈ 448.7 grams.