(1) A long distance telephone service provider charges $30 for the first 80 minutes of international calls. For each minute over 80 minutes, the
company charges $0.60 per minute. Write an equation that represents the
total cost C for x minutes of long distance calls. Calculate the cost of talkin
105 minutes internationally.

For a science project, a high school research team conducted a survey of local air temperatures. based on the results of the survey, the found that the average temperatures were around 10 degrees higher than expected. this result was wrong. the trouble with the survey was that most of the locations were exposed to direct sunlight and located over asphalt or sand, which resulted in higher temperatures than normal. this is a classic example of an error in which phase of inferential statistics?