Find the value of the missing variables. Round answers to the nearest tenth. PLEASE HELP ILL GIVE BRAINLIEST

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.

∆red ≅ ∆ by rule will give brainiest if possible

Arational number that is equivalent to -20/4?