Answer:
$681.50
Step-by-step explanation:
$13.63 x 50 = $ 681.50
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By Stokes' theorem,

where

is the circular boundary of the hemisphere

in the

-

plane. We can parameterize the boundary via the "standard" choice of polar coordinates, setting

where

. Then the line integral is


We can check this result by evaluating the equivalent surface integral. We have

and we can parameterize

by

so that

where

and

. Then,

as expected.
3 1/2 - 1 + 6 1/2= 9 feet is how far he walked