Ayuda por favor me urgue Una lámina rectangular de aluminio de 0.5m de largo y 0.25 m de ancho se calienta de 10 °C a90 °C. ¿Cuál será la variación de su superficie?​

Hi, your answer is not correct. this is a cumulative  

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other