Cats and dogs 1. suppose we are looking at a picture, and someone says "some cat is seen by dog." (that is, some fixed cat has the property that it is seen by every single dog.) assuming this statement, prove that every dog sees some cat. your proof should be semi-formal. for example, at some point, your proof should say "let d be a dog." and the end of your proof should be "therefore, every dog sees some cat." 2. suppose that someone says "every dog sees some cat." does it follow that some cat is is seen by every dog (in the sense above)?

Could someone with number 1 and 2

If 2(a^2+b^2)=(a+b)^2 then, > a+b=0, > ab=0, > a=b, > 2a=b

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.