Quien me ayuda con esta Actividad si no la hago podre graduarme y buej no entiendo mucho las matematicas.. Teoria Combinaria-Permutaciones:

si disponen de 6 libros de matematicas 4 de fisica, y 5 de biologia, si cada uno es de un autor diferente, ¿calcular de cuantas maneras pueden colocarse todos ellos en un estante con la condicion de que los de cada materia esten juntos

Arestaurant offers a $12 dinner special that has 5 choices for an appetizer, 12 choices for an entrée, and 4 choices for a dessert. how many different meals are available when you select an appetizer, an entrée, and a dessert? a meal can be chosen in nothing ways. (type a whole number.)

Last year, a state university received 3,560 applications from boys. of those applications, 35 percent were from boys who lived in other states. part a)how many applications did the university receive from boys who lived in other states? part b)applications to the university from boys represented 40percent of all applications. how many applications did the university receive in all? i don't how to do part b so me and plz tell how you got your answer

Which graph represents the parent function of y=(x+2)(x-2)