Stuck on trig could use some help finding the tangent of A

Asimple random sample of size nequals14 is drawn from a population that is normally distributed. the sample mean is found to be x overbar equals 70 and the sample standard deviation is found to be sequals13. construct a 90% confidence interval about the population mean

Use set builder notation to represent the following set: { -3, -2, -1, 0}

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?