Question: Need help with these questions please 18. (four marks) Evaluate -6257 19. (four marks) A radioactive sample with an initial mass of 35 mg has

Need help with these questions please

18. (four marks) Evaluate -6257 19. (four marks) A radioactive sample with an initial mass of 35 mg has a half-life of 3 days. Which of the following equations models the exponential decay for time, t, in days? 20. (four marks) A bacterial colony with an initial population of 50 doubles every 5 h. Which of the following equations models the exponential growth for time, t, in hours

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