Factor completely 5b2+20ab+15a2

Find the solution of system of equation y= x-4 y=4x+2

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.)

Ateacher noticed 5/8 of the students were wearing either blue shorts or white shorts. write two different ways this could be done.