Pls pls help me I don’t understand this

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.

Normal yağmur ile asit yağmuru arasındaki fark nedir

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)