Artillerymen on a hillside are trying to hit a target on a mountain on the other side of a river. The shells path is modeled by the equation y= -80x^2 + 120x + 610. The left side of the river is at y = 0 and the target is at y = -2. (x is in kilometers, y is in meters) a. How high above the river will the shell be when it crosses: the right riverbank (x=2) and the left riverbank (x=0)
b. Approximately where will the shell be when y = 130
c. A reconnaissance plane is flying over the river at a height of 660 meters above the river. Is it in danger of being hit by the shells fired along the given path?

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.