Answer:
63360 inches in one mile so you can do the rest of the math
60 inches because the square has 4 sides so 4x2 is 8 and 52+8 is 60.
These lines are perpendicular because y = -6 is a horizontal line with a slope of 0 and x = 6 is a vertical line with an undefined slope
Ohh wow nice, do your own work lazy person