Idk how to delete questions so

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

A, b, c, and d have the coordinates (-8, 1), (-2, 4), (-3, -1), and (-6, 5), respectively. which sentence about the points is true? a. a, b, c, and d lie on the same line. b. and are perpendicular lines. c. and are parallel lines. d. and are intersecting lines but are not perpendicular. e. and are parallel lines.

What is the value of f(x) = 2.2 for f(-2)?