A nuclear power plant produces strontium-90 at a rate of 3 kg/yr. How much of the strontium produced since 1971 (when the plant opened) was still around in 1992? (The half-life of strontium-90 is 28 years.)

Question

anonymous · Answer

I wanted to use the half life formula$$N=N _{0}(1/2)^{t/t _{1/2}}$$
$$t _{1/2}= half-life$$

anonymous · Answer

I know i have to differentiate but i don't know where to go from here

anonymous · Answer

anyone?

anonymous · Answer

alright flutter it, i think i figured it out