The rate of change:
( y2 - y1 ) / (x2 - x1) = ( 18 in - 12 in ) / ( 6 ft - 4 ft ) =
= 6 in / 2 ft = 3 in / 1 ft
Answer: D ) 3 inches up per foot across
You would use TOA from trig so your equation would be
Opposite = tan(angle) X adjacent
X = tan(15) X 400
It should equal 6000 but check that using the equation on a calculator :)
