The length of a rectangle is increasing at a rate of 7 cm/s and its width is increasing at a rate of 6 cm/s. when the length is 9 cm and the width is 7 cm, how fast is the area of the rectangle increasing?

Let x represent the length.let y represent the width.we are givenwe are trying to find when .the formula for the area of a square relates length, width, and volume.differentiate both sides with respect to time, t.use the power rule to differentiate.substitute informationthe area increases at

The answer is b: step 2.