Un centro comercial tiene varias formas de pago: con tarjeta de crédito de cuatro bancos diferentes, tarjeta de débito de las mismas compañías
bancarias, vales de despensa de tres empresas diferentes ó con efectivo.
¿Cuántas formas diferentes hay para pagar un mismo producto?

Is there a direction u in which the rate of change of f(x,y)equals=x squared minus 3 xy plus 4 y squaredx2−3xy+4y2 at p(1,2) equals 14? give reasons for your answer. choose the correct answer below. a. no. the given rate of change is smaller than the minimum rate of change. b. no. the given rate of change is larger than the maximum rate of change. c. yes. the given rate of change is larger than the minimum rate of change and smaller than the maximum rate of change.