What is the coefficient of 12x -50=460

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.

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?