Why is it important to understand how to solve linear equations

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

Consider the proof. given: segment ab is parallel to line de. prove: what is the missing statement in step 5?

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)