Question: Please attach the solutions to this question. Thank you in advance 7. A radioactive substance has a half-life of 10 years. Its decay is modelled

Please attach the solutions to this question. Thank you in advance

7. A radioactive substance has a half-life of 10 years. Its decay is modelled by the equation A = Ace-kt, where A is the activity in Bq (Beequerel) after 1' years and A0 and k are constants. (a) After how many years will the substance be reduced to a quarter of its original activity? (5) Find the original activity if the activity after 5 years is 200 Bq. (c) Find the activity remaining after 15 years

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