Part 5 of 5 wy Score: 90%, 9 or 10 points Points: 0 of 1 Save A company estimates that it will sell N(x) units of a product after spending $x thousand on advertising, as given by N(x)= -0.25x +22x-472.5x2 +79,000, where 21 x45 When is the rate of change of sales increasing and when is it decreasing? What is the point of diminishing returns and the maximum rate of change of sales? Graph N and N' on the same coordinate system. The rate of change of sales is increasing on (21,35) (Type your answer in interval notation.) The rate of change of sales is decreasing on (35,45) (Type your answer in interval notation.) The point of diminishing returns is 35 thousand dollars. The maximum rate of change of sales is 4,900 sales per thousand dollars. (Round to the nearest whole number as needed.) Graph N and N' on the same coordinate system. Choose the correct answer below. XA. O B. 110000- 110000 N N a N' Part 1 of 5 G C. 110000 N' Points: 0 of 1 OD. 110000- N Similar question Save A company estimates that it will sell N(x) units of a product after spending $x thousand on advertising, as given by N(x) = -0.25x + 23x-540x + 84,000, where 24x 45. When is the rate of change of sales increasing and when is it decreasing? What is the point of diminishing returns and the maximum rate of change of sales? Graph N and N' on the same coordinate system. The rate of change of sales is increasing on (Type your answer in interval notation.) Clear all Check wer