MAT 2322 Lecture 9: oct13

The rate of sales of a certain brand of bicycle by a retailer in thousands of dollars per month is given by S(t) = 31t-0.45p? dt where t is the number of months after an advertising campaign has begun. (a) Find the amount of sales, in thousand of dollars, for the first three months after the start of the advertising campaign. Give you answer to three decimal places. thousand dollars (b) Find the average sales per month for the second three month period of the advertising campaign. Give you answer to three decimal places. thousand dollars per month

Let C be the curve defined by the parametric equations x t and y t3- 6t (see Example 2). Find d'y/dx2. dx Use this result to determine the intervals where C is concave upward. O (o, 0) fort 0 (0, co) for t > 0 O (0, co) for t o 0 (-00, 0) for t 0 0 (0, oo) for t

Calcnals the vale of e (ytan 4) Arom a) t (1.1) In a straigh liues from Co,o to ( then u o) to (I) φ straight lines from (0.0) (Oil) then (o, I to (