At that point, the graph of has a horizontal tangent. This means that the graph of has a minimum at that point.
and
gives you , so at .
m/s
and therefore m/s.
km/h = m/s and gives you s.
for every
is the speed with which the profit increases (or decreases) as increases.
as .
The graph of is an open down parabola and therefore has a maximum at .
The maximum profit is therefore seen at sales of cars per year.
mg/L per day.
and mg/L per day.
The speed of degradation is getting smaller because the graph is decreasing less rapidly.
You cannot rearrange such that it would be possible to divide by . This means that you cannot calculate the limit for at this point.