9514 1404 393
Answer:
increasing 9000 units per week
Step-by-step explanation:
The price and sales relation is given as ...
6p³ +x² = 850
Differentiating with respect to time gives ...
18p²·p' +2x·x' = 0
Filling in the given values, we have ...
18(5)²(-0.40) +2(10)x' = 0
20x' = 180 . . . . . . add 180
x' = 9 . . . . . . . . . . divide by 20
Sales are increasing at the rate of 9,000 units per week.
