Help me please I’m begging

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

Ade and abc are similar. which best explains why the slope of the line between points a and d is the same as the slope between points a and b?

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?