A radioactive substance has a half-life of 5 million years. What is the age of a rock in which 25% of the original radioactive atoms remain? You must show your work or explain how you came up with your answer for full credit.

Why is the continuous presence of police officers and vigilant members of the public an ineffective crime prevention strategy? *criminology*

Give an example of a situation in which an individual's pursuit of economic self-interest may not benefit but instead harm the rest of society

Which of the following departments would be included in a state government's public safety function? department of education department of emergency management department of environmental protection department of banking and consumer finance