Mia is factoring the polynomial x^2+4x-12. she uses the steps shown. in which step did mia make an error?

What number should be added to both sides of the equation to complete this square? x^2-10x=7

For each proportion find the unknown number x 1/5/8=×/15

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.