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Online ProgramThe function \(f(x)=60\left(0.75\right)^{x} \)models the decay of a rare substance found in a cave. Its graph is shown below. Scientists want to begin testing the substance when the sample size is approximately 10 mg. What part of the domain of this function is used to model the time they must wait to begin testing? Enter your answer to the nearest integers using brackets [ ] Ex.[a,b]