3x - y = 7 6x - y = 10 when solving this system of equations by elimination, which could be the resulting equation when a variable has been eliminated? a) 9x - 2y = 17 b) -3y = 24 c) -3x = -3 d) 9x = 17

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