If the half-life is 5 minutes, then 30 minutes is equivalent to 6 half-lives. So, after six successive half-lives, the 400 mg of the radioisotope would have a mass of 400(0.5)⁶ = 6.25 mg.
Thus, A would be the correct answer choice here.
Answer:
an F of course 50 is wrong so jussg
because you will acostumbrate to do that alway then when a accident happens you do not have the seat belt you could have a big accident
I wish you the best of luck!
