Represent what you have to be more specific
The answer is 1090 pounds because 1300, the max weight, minus 210, the baggage, is 1090. Hope this helps!
The number is 23 thats what i got

Suppose the ODE has a solution of the form
, with total differential

This ODE is exact if the mixed partial derivatives are equal, i.e.

We have


so the ODE is indeed exact.
Integrating both sides of

with respect to
gives

Differentiating both sides with respect to
gives





so the general solution to the ODE is

Given that
, we find

so that the solution to the IVP is


Since it a is a square and they are equal on all 4 sides. x=4