A medical ninja has a 15-gram sample to I-131 and would like to know its half-line, in days. He also knows that k= 0.0856.
N = N0e^-kt

N0 = 15 grams
N = 7.5 grams
K = 0.0856
t = ?
Find the half-line, in days, of I-131 using the information given. Round your answer to the nearest tenth.
(Lol I changed scientist to ninja b/c Naruto is awesome.)

Question

A medical ninja has a 15-gram sample to I-131 and would like to know its half-line, in days. He also knows that k= 0.0856. 
N = N0e^-kt

N0 = 15 grams
N = 7.5 grams
K = 0.0856
t = ?
Find the half-line, in days, of I-131 using the information given. Round your answer to the nearest tenth.
(Lol I changed scientist to ninja b/c Naruto is awesome.) <3

Thanks your help!

ganeshie8 · Answer

Plugin the given values into the equation
$$\large N = N_0e^{-kt}$$

ganeshie8 · Answer

$$\large 7.5 = 15e^{-0.0856t}$$

alekos · Answer

do you know what to do next?

anonymous · Answer

is it 8.1?

alekos · Answer

how the devil did you get that?