Find the sum of 12-0=

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

How do you use the elimination method for this question? explain, because i really want to understand!

What is the location of point g, which partitions the directed line segment from d to f into a 5: 4 ratio? –1 0 2 3