Mark on the grid all the points that fulfill all three inequalities

Graph y ≥ -x^2 - 1. click on the graph until the correct graph appears.

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Now, martin can reasonably guess that the standard deviation for the entire population of people at the mall during the time of the survey is $1.50. what is the 95% confidence interval about the sample mean? interpret what this means in the context of the situation where 95 people were surveyed and the sample mean is $8. use the information in this resource to construct the confidence interval.