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


48 = 2(w+4) + 2w
48 = 4w+8
40 = 4w
w= 10 yd
A= 10 * 14
A = 140 yd
30.Monday 5hours Tuesday 3 hours
31. Wednesday 8 hours
Answer:
66
Step-by-step explanation:
Answer: A
Step-by-step explanation: