Answer to Question #44888 in Calculus for Ashvini
by S =AT + 450/√A + T^2 where T is the time (in months) since the product was first introduced and
A is the amount (in hundreds of dollars) spent each month on advertising. Assume A, T > 0.
(a) Calculate the partial derivative of S with respect to time. Use that partial derivative to
predict the number of months that will elapse before sales volume begins to decrease if
the amount allocated to advertising is held fixed at $9, 000 per month.
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