$10$

Multiple Choice

$1$ point

If $f(x)$ represents the marginal cost at $x$ items and the fixed costs are $C,$ which of the following is not true?

${\displaystyle \underset{0}{\overset{100}{}}}f(x)dx+C$ will tell you the total cost to produce $100$ items.

${\displaystyle \underset{0}{\overset{100}{}}}f(x)dx-{\displaystyle \underset{0}{\overset{50}{}}}f(x)dx$ will tell you the additional cost to produce items $50$ through $100.$

$f(5)=7$ tells you that the cost to produce the $6^{th}$ item will be $$7.$

$C$ will tell you the variable cost to produce $50$ items.