30 = 6 x 5
6 = 3 x 2
8 = 4 x 2
4 x 2 + 3 x 2 + 6 x 5 = 44
Answer:
The y-coordinate is changing by the rate of -70 cm per sec.
Step-by-step explanation:
Given equation,

Differentiating with respect to time (t),

We have,


Profit=no of katanas sold * (selling price of each katana-cost of making one katana) - cost to run the website