When donelle stands at point r he is 1000 feet from point s at the base of the cliff. When he look up at an angle of 20° he sees a friend at the top of the mountain cliff at point t. Which measurement is the closest to the height of the mountain cliff in feet.

Twelve different video games showing substance use were observed and the duration times of game play (in seconds) are listed below. the design of the study justifies the assumption that the sample can be treated as a simple random sample. use the data to construct a 99% confidence interval estimate of μ, the mean duration of game play. 4028 4316 4816 4650 4036 5010 4833 4331 4307