How do I find an equation of decay?

[disparate]

Find an equation of decay for a radioactive sample in the form f(t) = km^t, where f(t) is the amount of the sample at time t, if f(0)=100 and f(5)=50.

How would I go about finding the equation for this?

 

[Deleted member 4993]

Find an equation of decay for a radioactive sample in the form f(t) = km^t, where f(t) is the amount of the sample at time t, if f(0)=100 and f(5)=50.

How would I go about finding the equation for this?

Go back and read your post:

http://www.freemathhelp.com/forum/t...equation-for-this-problem?p=363029#post363029

same problem - different givens.

In the other problem, the amount at t=1000 years was given - here you are given the amount at t =5.

 

[HallsofIvy]

Find an equation of decay for a radioactive sample in the form f(t) = km^t, where f(t) is the amount of the sample at time t, if f(0)=100 and f(5)=50.

How would I go about finding the equation for this?

Put the numbers given into the formula provided: f(0)= km⁰= 100 and f(5)= km⁵= 50.
I presume you know that m⁰= 1.

 

[disparate]

Many thanks for all the help guys, I've figured it out