Ba and bc are tangents to circle o at points a and c. if ba=7in and oa=3in, find the perimeter of quadrilateral OABC

In triangle abc segment de is parallel to the side ac . (the endpoints of segment de lie on the sides ab and bc respectively). find de, if ac=20cm, ab=17cm, and bd=11.9cm;

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

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x