Hi. I have 3 of 7 marks on this problem so far, looking for the other 4. I don't believe I have "shown clearly" that x^2+12x-160=0, but everything I've tried produces no more marks. I'm also not sure I've shown enough of the factorisation, but again everything I've tried has produced no more marks.

Mathswatch is notoriously selective when it comes to the phrasing of answers, so I'm hoping someone out there has answered this exact question with full marks and knows what Mathswatch expects to see here. Any help would be appreciated though.

Apoll is being conducted at a mall nothingto obtain a sample of the population of an entire country. what is the frame for this type of​ sampling? who would be excluded from the survey and how might this affect the results of the​ survey? what is the frame for this type of​ sampling? a. the frame is people who need new clothes. b. the frame is people who shop at the mall. c. the frame is people who like to shop. d. the frame is the entire population of the country. who would be excluded from the survey and how might this affect the results of the​ survey? a. any person that does not need new clothes is excluded. this could result in sampling bias due to undercoverage. b. any person who does not shop at the mall is excluded. this could result in sampling bias due to undercoverage. c. any person who does not shop at the mall is excluded. this could result in nonresponse bias due to people not participating in the poll. d. there is nobody that is being excluded from the survey.