How much of a radioactive kind of thallium will be left after 4 minutes if you start with 9,992 grams and the half-life is 2 minutes?

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(1,4) is on graph of f(x)

f(1) = 4

so 1/4 f(x)

1/4 f(1)

1/4. ×4

1

so point for function 1/4. f(x) is (1,1)

answer: x=60