Aprocess to extract pectin and pigment from sunflower heads involves washing the sunflower heads in heated water. a model for the percentage of pigment that can be removed from a sunflower head by washing for 20 minutes in r milliliters of water per gram of sunflower when the water temperature is t°c is p(t, r) = 306.761 − 9.6544t + 1.9836r + 0.07368t2 − 0.02958r2 percent (a) locate the critical point of the pigment removal function. (round yours answers to three decimal ) identify the point in part (a) as a relative maximum, a relative minimum, or a saddle point