What is the slope for (3,-4) (5,-4)

What are the coordinates of the image of p for a dilation with center (0, 0) and scale factor 2

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?

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)