We're looking for a solution of the form
. By the chain rule, this solution should have total differential

and the equation is exact if the mixed second-order partial derivatives of
are equal, i.e.
.
The given ODE is exact, since


Then




With
, we get


Answer:
282.74
Step-by-step explanation:
The length is 30 meters and the width is 12 meters.
Answer:
850
Step-by-step explanation: