Tickets to a dance cost $6.50 in advance. Tickets at the door cost $8.00. A group spent $177.50 on tickets. They bought ten tickets at the door. Write an equation to describe this situation and solve it to find the number of tickets bought in advance by the group. Include statements defining the variable(s) and a concluding statement.

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?