Question

The profit from producing x hundred thousand cigars is estimated by: P(x)= -x^3+28x^2+20x-60

Where 0 is less than or equal to x is less than or equal to 20. Find the point of diminishing returns.

Answer 1

Please check the question again, because x cannot be less than or equal to 0 and it also cannot be less than 20 at the same time.

Please check the question and type it again.

Answer 2

However, if it is less than 0:
\[0\le-x ^{3}+28x ^{2}+20x-60\]

Answer 3

if it is less than or equal to twenty, then you write instead of 0, twenty.