Answer:
a _ 12×21000/7 = 36000
b _ 33 × 7 / 21000= 11 months
If there is such a scalar function <em>f</em>, then



Integrate both sides of the first equation with respect to <em>x</em> :

Differentiate both sides with respect to <em>y</em> :


Integrate both sides with respect to <em>y</em> :

Plug this into the equation above with <em>f</em> , then differentiate both sides with respect to <em>z</em> :



Integrate both sides with respect to <em>z</em> :

So we end up with

Answer:
(btw the first question answer is -4, not 0)
10
Step-by-step explanation:
(btw the first question answer is -4, not 0)
So to solve the 2nd equation you substitute t with 30
so 30-2/3*30
30-20=10