Help me on these questions

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

To determine the number of deer in a forest a forest ranger tags 280 and releases them back

Hurry which expression is equivalent to 3√x^5y?