I'm not sure what equation to use or how to do it. I know we are looking for the sample size. The answer is 2401 but can someone show me the work that goes into it. I would really appreciate it....

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I'm not sure what equation to use or how to do it. I know we are looking for the sample size. The answer is 2401 but can someone show me the work that goes into it. I would really appreciate it....

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I would highly appreciate any answers with steps.

it's a math for school please help