Answer:
$11.81
Step-by-step explanation:
Add
2.00
3.94
2.29
2.29
2,29
Equals
$12.81
minus
$1.00
Equals
$11.81
Let's check if the ODE is exact. To do that, we want to show that if

then

. We have


so the equation is indeed exact. We're looking for a solution of the form

. Computing the total differential yields the original ODE,


Integrate both sides of the first PDE with respect to

; then

where

is a function of

alone. Differentiate this with respect to

so that



So the solution to this ODE is

i.e.
16 is 25 percent of the number so if you multiply 4 on top and bottom, you get 64.
It would be: 2/3 * 9/10 = 2*3 / 10 = 6/10 = 3/5
So, your answer is 3/5