Question

A company estimates that it will sell N(x) packages of computer mice and keyboards after spending $x thousand on advertising, as given by: N(x) =-25x4 + 13x3-180x2 + 10000 where 15 24 a. Show that the rate of change in sales is increasing on the given interval? Use analytical calculus methods 2. discussed in the chapter. Find the point of diminishing returns within the interval. Only state the x-value using proper units. Be sure to prove your answer using analytical calculus methods. b. Explain what the point of diminishing returns means in context of the story. c.

Answer 1

co) 、木 -3 (x2-26x +120 -3(x-20) (x-6) = IS

rb) a Nux IS leak具