Answer:
Line A, (horizontal slope), Line B, (Negative slope) Line C, (Vertical slope) Line D, (Undefined slope)
Step-by-step explanation:
Well, he used one box to decorate his yard, that's for sure. Then he used 40 from the other box to decorate his porch and the rest inside his house. That rest might be anything between 1 and infinity. So there were at least 41 balloons in each box. I think the question is incomplete, please doublecheck it so I'll be able to give you more specific result.
Near the point (6, 6, 3), we have the approximation

where the subscripted

's refer to the corresponding partial derivatives.


So

Compare to more precise value,
Step-by-step explanation:
f
(
x
)
=
12
Since
12
is constant with respect to , the derivative of
12
with respect to is
0
.