Question: please show work for each question 2. C GCCAZ CHM 152LL, 2023 (6 pts) The half-life of strontium- 85 is 64.84 days. How much time

please show work for each question

2. C GCCAZ CHM 152LL, 2023 (6 pts) The half-life of strontium- 85 is 64.84 days. How much time would it take for 847mg of strontium-85 to decay to 239mg ? 3. (9 GCCAZ CHM 152LL, 2023 ( 6 pts) The half-life of bismuth-213 is 46.1 minutes. How many minutes does it take for a sample of Bi213 to decay to 5.63% of its initial value? 4. O GCCAZ CHM 152LL, 2023 (6 pts) The half-life for cobalt-60, a radionuclide used to treat brain cancer, is 5.27 years. Calculate the percentage of cobalt-60 remaining after 1.25 years. Use three significant figures for the percentage

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