Answer: Side p = 33.9 mi
Step-by-step explanation: The figure in the question is a trapezoid with the area already given as 792.965.
The unknown side p is one of the two bases (parallel lines) in the trapezoid. The area of a trapezoid is given as
Area of trapezoid = {(a + b)/2} x H
Where H is the vertical height and a and b are the parallel lines
The area of the trapezoid can now be properly expressed as
792.965 = {(15.2 + p)/2} x 32.3
By cross multiplication we now have
792.965/32.3 = (15.2 + p)/2
(792.965/32.3) x 2 = 15.2 + p
49.1 = 15.2 + p
Subtract 15.2 from both sides of the equation
33.9 = p
Therefore the missing length (side p) equals 33.9 mi
