How many gallons are in Two-fifths of a One-half-gallon container of milk?

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.

Ined this is due tomorrow and i dont know the answer can you find all the exponents

How many solutions does the nonlinear system of equations graphed below have?