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a) (), b) (), c) , d) , e) (), f) (), g) ()

Step-by-step explanation:

All radioactive isotopes decay exponentially, the mass of the isotope as a function of time (), measured in grams, is defined by:

(1)

Where:

- Initial mass of the isotope, measured in grams.

- Decay rate, measured in or or .

- Time, measured in minutes, days or years.

We define the decay rate in terms of half-life by using the following expression:

(2)

Where is the half-life of the isotope, measured in minutes or years.

Now we proceed to determine the missing values:

a) Polonium-200 ()

b) Lead-194 ()

c) Iodine-125 ()

d) Kryption-75 ()

e) Strontium-79 ()

f) Uranium-229 ()

g) Plutonium-239 ()

answer: 10 meter

step-by-step explanation:

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