Search results

if you're talking about the t sub question, im pretty sure carrotstick's solution is correct

was more difficult than last years :mad3:

i got 905 as well, perhaps the answer is wrong

1. t =23 will give you 8230 2. since it is decaying the equation is P=Ae^-kt initially A = 1 but it decays to 0.25 after 68 min thus k =-1/68ln(0.25) when t =180 P=e^1/68ln(0.25)x180 =0.0254x100 = 2.5%