Question 66053
First you must realize you are working with 1800 FEET (rise) and 3.25 MILES (run).
You MUST convert one of these in order to make it work.  I would convert the feet to miles.
{{{ 5280/1800 = 0.293 }}} the three repeats so this is a viable distance.
slope = m = rise/run
{{{ m = 0.293/3.25 }}}
Divide
{{{ m = 0.0901538 }}} This goes on an on
round to the nearest hundreth
{{{ m = 0.09 }}} or {{{ m = 9/100 }}}