What is the equation on the graph

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.

What term best describes a line and a point that lie in the same plane? a. congruent b. coplanar c. collinear d. equal

Which expression is equivalent to the expression shown?