Question

Need Help!!!..

Answer 1

Okay. So we're obviously going to want to use the equation\[N_f = N_ie^{kt}\]Can you start filling in any of the terms of the equation?

Answer 2

Sorry i dont even know this...can you help me fill it out?

Answer 3

Sure. So \[N_i\]Is your sample size at the beginning, e is the number 2.71, t is the time, and k is the decay constant, which is found with this equation:\[k = \frac{ -\ln2 }{ half-life }\]So now can you start filling anything in? I'm not just going to give you the answer, but I'll help you along.

Answer 4

so the bottom would be 138?

Answer 5

Of the fraction for k? Yes. So now evaluate.

Answer 6

Do you know how to evaluate that fraction with a calculator?

Answer 7

Im a little confused, where did you get 2.71?

Answer 8

Do you know the number e?

Answer 9

Okay then...I'll assume the teacher wants you to do this the simpler way that isn't as exact. So let's start over from the beginning. Sound good?

Answer 10

@kevincourtes?

Answer 11

..?

Answer 12

Sorry, i want able to respond.