Question 72302
Using this information you should construct a triangle & using the graphing technique:
Plot the 1800 feet on the y axis (0,1800) now plot the 3.25 miles on the x axis (3.25*5280,0)or(17160,0).
now calculate the slope od a line through these two points thus:
(y2-y1)/(x1-x2) 
(1800-0)/(0-17160)
1800/17600
-.10 is the slope.