Answer:
You will have 1.585 left after 35 years.
Step-by-step explanation:
Equation for amount of a substance:
The equation for the amount of a substance, using exponential decay, is given by:

In which A(0) is the initial amount and r is the decay rate, as a decimal.
The half-life of BRADIUM-29 is 15 years.
This means that
. We use this to find r.



![\sqrt[15]{(1 - r)^{15}} = \sqrt[15]{0.5}](https://tex.z-dn.net/?f=%5Csqrt%5B15%5D%7B%281%20-%20r%29%5E%7B15%7D%7D%20%3D%20%5Csqrt%5B15%5D%7B0.5%7D)


Then


You have 8 ounces of this strange substance today
This means that
. So


How much will you have left after 35 years?
This is A(35). So


You will have 1.585 left after 35 years.