Question

Solve.

The function A = A0e-0.01386x 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 400 pounds of the material are initially put into the vault, how many pounds will be left after 120 years?
A) 76 pounds
B) 480 pounds
C) 300 pounds
D) 83 pounds

Answer 1

\[A=A _{0}e ^{-0.01386x}\]

Answer 2

what is
a0=?

Answer 3

ahh hello

Answer 4

went to eat :)

Answer 5

i thought you left me!

Answer 6

what is given in the probelm?

Answer 7

that i forgot how to do this and i lost my mind a long time ago!

Answer 8

\[A=A_0e^{-0.01386x}\]
what does x represent ?
\[A_0 .... represents ?\]

Answer 9

btw wheres my food? im eating your cookie

Answer 10

1

Answer 11

lol u already eating the cookie so no food

Answer 12

haha that's fine! im sick of eating food

Answer 13

it will make u fat too :p

Answer 14

The function A = A0e-0.01386x 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 400 pounds of the material are initially put into the vault, how many pounds will be left after 120 years?

Answer 15

x represent the years!

Answer 16

i got to go ill get on in a little bit.

Answer 17

how many years does it say in the problem

Answer 18

ok

Answer 19

ok im back!

Answer 20

its says 120 years

Answer 21

k nice now what is A0?

Answer 22

400?

Answer 23

yes its the initial value

now plug the numbers into the equation

Answer 24

400e^-0.01386(120)

Answer 25

76 pounds

Answer 26

correct