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When a certain radioactive element decays, the amount, in milligrams, that remains after t years can be approximated by the function A above. Approximately how many years would it take for an initial amount of 800 milligrams of this element to decay to 400 milligrams?

a. 173
b. 347
c. 693
d. 1,386
e. 2,772

Sagot :

hrebenmichael

Answer: C.693

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