
Decay rates
I'm having second thoughts on the answers I came up with...
Einsteinium235 decays at a rate of 3.406% per day.
a. find the annual decay rate in exact form:
100(.96594)^365
b. Compute an approximation of your solution in part a accurate to two decimal places:
(This is where I was thrown off, as my equation truncated to two decimal places comes out to be 0.00, and I'm sure that's not the intention.)
3.21 x 10^4
c. Find the halflife of Einsteinium235 in exact form:
100(.96594)^t=50
log(96.594^t)=log(50)
t x log(96.594)=log(50)
t=(log(50))/(log(96.594))
d. Compute an approximation of your solution in part c accurate to two decimal places
0.85
(But I know that's obviously wrong. (Headbang))
Any help appreciated.

Halflife can easily be gotten from the formula
You know k, enter it in and solve for T.

What about my decay rate?
