Aradioactive isotope takes 80 minutes to decay from 64 grams to 4 grams. let y(t) denote the amount of the isotope (in grams) present after t minutes.
1. find the constant c and k such that y(t)=ce^-kt

2. how long do we have to wait (in minutes) if we want the mass of the isotope to drop below 1 gram?

answer: your gay

step-by-step explanation:

you dont know math

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.