Is 5.231 rational or irrational

Hi my sisters and brothers can tell me the answer because i don’t understand the question

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.

The table represents a function. what is f(-2)? a.-3 b. -1 c.1 d.3