Question 1202410
.
<pre>

(A)  Formula (A) is written incorrectly,
     so we will not discuss it.



(B)  Formula (B) correctly describes the given information,
     giving the maximum value of $10000 at x= 150 minutes

     and giving correct values of $6000 at x= 100 minutes and x= 200  minutes.



(C)  Formula (C) gives the maximum half-way between the roots 1000 and 6000, i.e. at x= 3500,
     which is not the case.  So, formula (C) does not work.



(D)  Formula (D) gives the maximum half-way between the roots 100 and 200, i.e. at x= 150,
     which is good; but it gives the zero values at x= 100 and x= 200 minutes,
     which is not consistent with the given info.


<U>ANSWER</U>.  Only formula (B) is consistent with the description.
</pre>

Solved.