d= distance travelled = 6 km
P= 5d²+270
= 5(6)²+270
=5 ×36 +270
= 180+ 270
= 450
Taxi fare = 450 pence
The formula for this, as you stated, is Volume = Length * Height * Width.
Therefore, the Volume is 10*7*8, or 560
Therefore, the volume of the box is 560 cm^3
Hope this helped!! :D
You're looking for the extreme values of
subject to the constraint
.
The target function has partial derivatives (set equal to 0)


so there is only one critical point at
. But this point does not fall in the region
. There are no extreme values in the region of interest, so we check the boundary.
Parameterize the boundary of
by


with
. Then
can be considered a function of
alone:



has critical points where
:



but
for all
, so this case yields nothing important.
At these critical points, we have temperatures of


so the plate is hottest at (1, 0) with a temperature of 14 (degrees?) and coldest at (-1, 0) with a temp of -12.