Question

The function A = A0e-0.0077x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 700 pounds of the
material are initially put into the vault, how many pounds will be left after 200 years?

Answer 1

subst. A0=700
and x=200

Answer 2

thanks...

Answer 3

i'm getting a negative answer. :(

Answer 4

\[700\times e^{-.0077\times 200}\]

Answer 5

http://www.wolframalpha.com/input/?i=700*e^%28-.0077*200%29

Answer 6

about 150

Answer 7

thanks!!

Answer 8

yw