Andrew measures the amount of a very unstable substance to be 100 moles. The half-life of this substance is 3 days (after 3 days half is gone).
Wrinte an exponential function (form y=ab^x) that models this situation. Y is the amount of the substance and x is the time in days.

Question

Andrew measures the amount of a very unstable substance to be 100 moles. The half-life of this substance is 3 days (after 3 days half is gone).
Wrinte an exponential function (form y=ab^x) that models this situation. Y is the amount of the substance and x is the time in days.

anonymous · Answer

please help!

jim766 · Answer

if it is half gone in 3 days, how much will be gone in 1 day?

anonymous · Answer

isn't that irrelevant?

jim766 · Answer

they say they want the equation written where x is the number of days...

anonymous · Answer

right, but it had to be in the form y=ab^x

jim766 · Answer

yes     a is the initial amount
          b is the multipier

jim766 · Answer

if they wanted the equation where x was the number of 3 day periods
the equation would be 

y = 100(1/2)^x

anonymous · Answer

okay i'll try it

anonymous · Answer

thanks