At a certain factory, the total cost of manufacturing q units during the daily production run is C(q) = q^2 + q + 900 dollars. On a typical workday, q(t) = 25t units are manufactured during the first t hours of a production run.
(a) Express the total manufacturing cost as a function of t.
C(t) =
(b) How much will have been spent on production by the end of the fourth hour?
$
(c) When will the total manufacturing cost reach $6000?
After