The length x of a rectangle is increasing at the rate of 2 cm/minute and the width y is decreasing at the rate of 2cm/minute. When x =10cm and y = 10 cm, find the rates of change of the area of the rectangle |
40 cm2/min -40 cm2/min 0 cm2/min none of these |
0 cm2/min |
dA/dt = -2x+2y |