Expressed in simplified radical form what is the value of √r-√16r when r=2

When drawing a trend line for a series of data on a scatter plot, which of the following is true? a. there should be an equal number of data points on either side of the trend line. b. all the data points should lie on one side of the trend line. c. the trend line should not intersect any data point on the plot. d. the trend line must connect each data point on the plot.

100 points, hi, i’m not sure how to get the equation from the graph and table.

What percent of the circle below is shaded?