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1. The percentage of the original activity in the sample remains after 17.5 days is obtained as N(t) / No x 100%.

   What is half life?

   Half-life is the time required for a quantity to reduce to half of its initial value.

   The original activity in the sample that remains after 17.5 days is calculated from half life equation as shown below;

   N(t) = No(¹/₂)^t/h

   where;

   • N(t) is the mass of the substance remaining
   • No is the initial mass of the substance
   • t is time elapsed = 17.5 days
   • h is the half life of the substance

   percentage of the original activity in the sample remains after 17.5 days;

   = N(t) / No x 100%

   Thus, the percentage of the original activity in the sample remains after 17.5 days is obtained as N(t) / No x 100%.

   Learn more about half life here: https://brainly.com/question/2320811

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