EASY - related rates question about rectangle area
A rectangle has one side of 8 cm. How fast is the area of the rectangle changing at the instant when the other side is 18 cm and increasing at 2 cm per minute?
This is how I set it up:
dA/dt = L(dw/dt) + w(dL/dt)
0 = 18(dw/dt) + (8)(2)
I keep getting 0 cm^2/min as my answer which is obviously wrong