If 40% of the seniors at a certain school are bilingual and 20% of the bilingual seniors speak spanish ,what percentage of seniors at the school are bilingual seniors who speak spanish?

Can someone me out here and the tell me the greatest common factor

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.

What is the result of the following division?