Question

please help and explain see attachment

Answer 1

72 years will be 6 periods since 1/2 life = 12 years
t= 6
20 (1/2)^6/24 = 20 (1/2)^1/4

to round to the nearest hundredth of a gram calculate to 3 decimal places then round to 2 decimal places. hundredth means to 2 decimal places.

Answer 2

@jim_thompson5910 can you verify and explain this some more please?

Answer 3

16.82 is what i come up with??

Answer 4

yes that's what I have.

Answer 5

i still dont get how you got t

Answer 6

72/12

read the first post

Answer 7

every 12 years t will change by 1
you have 72 years so 72/12 = 6 1/2- life periods

Answer 8

is states the half-life is 12 i thought thats how we were getting 24 for entire life

Answer 9

half-life means the time it takes for 1/2 the amount of the material to disintegrate.

Answer 10

o ok i think i get it now. thanks for the help

Answer 11

sorry not good at explaining exponential functions.
you are welcome.