I need help with 1 & 2 tyvm

Which expression gives the area of the triangle shown below

Somone me i want to know what 18 hours out of 24 hours in a fraction

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?