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?

you probably already have the answer but anyways it's b. 15.0

step-by-step explanation:

exa:

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3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.

fyuh

step-by-step explanation:

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