30 inches.
When trying to find the perimeter of a rectangle, add the lengths of all of the sides. So, 5 + 5 + 10 + 10 = 30.
Parallel lines has equal slopes. Hence slope of line = -1/2
equation of line is (y - y1) = -1/2(x - x1)
y - (-6) = -1/2(x - 4)
y + 6 = -1/2x + 2
y = -1/2x + 2 - 6
y = -1/2x - 4
One person. A 30 gram stone is very light.
