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Compute each part of given question:

Question: A radioactive isotope has a half-life of 76.0 min. A sample is prepared that has an initial activity of 16.0E¹⁰ Bq.

Part A: How many radioactive nuclei are initially present in the sample?

Part B: How many are present after 76.0 min?

Part C: How many radioactive nuclei are present 152.0 min after the sample was first prepared?

Part D: What is the activity after 152.0 min?

For some reason I keep getting it wrong I don't know if it's a calculation error. Please show your work so I can see what I'm doing wrong with this above question! Please help.

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