Jay and Pete are running in a race. At 9am Jay was 15 ft ahead of Pete, at 10am Pete was ‘f' ft ahead of Jay. Write an expression that shows how many more ft Pete ran than Jay between the hours of 9am and 10am?

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?