Two plumbing companies charge a flat free for a service call, plus an hourly rate for a plumbing repair. Marco’s plumbing charges $165 for a 2-hour plumbing repair or $255 for a 4-hour plumbing repair. Jack’s plumbing uses the equation C=100+40h to calculate the cost, C, for h hours of repairs. Which company charges more for 3-hour plumbing repair and how much more?

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?