What’s the median for the given data set ? 506,511,517,514,400,521,511,524,612 ,444

Is the response to the survey question "did you smoke in the last week question mark "response to the survey question "did you smoke in the last week? " a discrete random variable, a continuous random variable, or not a random variable?

Which of the following is true about the following construction of a tangent to a circle from a point outside of the circle?

Which graph or graphs appear to show a sinusoid? < me asap !