Answer:
36
Step-by-step explanation:
I'll go ahead and assume you meant to say that <em>S</em> is the surface given by

This immediately gives us a parameterization for the surface,

The upward-pointing normal vector to this surface is then

Then the flux of
across <em>S</em> is

Step-by-step explanation:
let
(-7,-8) =(x1, y1)
and (-6,7)=(x2, y2)
by the formula
d=√(y2-y1) ²+(x2-x1) ²
=√(7+8)²+(-6+7)²
=√15²+1²
= √225+1
= √226