a mirror with a parabolic cross section is used to collect sunlight on a pipe located at the focus of the mirror. the pipe is located 2 inches from the vertex of the mirror. write an equation of the parabola that models the cross section of the mirror. assume that the parabola opens upward.

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

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