Given xy=9 and (x+y)^2=21
find x^2+y^2

The fraction of defective integrated circuits produced in a photolithography process is being studied. a random sample of 300 circuits is tested, revealing 17 defectives. (a) calculate a 95% two-sided confidence interval on the fraction of defective circuits produced by this particular tool. round the answers to 4 decimal places. less-than-or-equal-to p less-than-or-equal-to (b) calculate a 95% upper confidence bound on the fraction of defective circuits. round the answer to 4 decimal places. p less-than-or-equal-to

Can anyone explain to me how to do this? anything will .

What are linear equations? could'ya explain too me, ? ! and how do you see what graph is a proportional relationship?