Emilio buys liter bottles of shampoo when the store has the promotion shown. Write an expression in two different ways to represent the total cost of 3 liters of shampoo. it shows a picture of a man holding shampoo and it says buy 2 liters and get 30% for the 3rd liter, Let L be the number of liter bottles. plz help asap

Abag contains 4 red, 7 blue and 5 yellow marbles. event a is defined as drawing a yellow marble on the first draw and event b is defined as drawing a blue marble on the second draw. if two marbles are drawn from the bag, one after the other and not replaced, what is p(b|a) expressed in simplest form? a. 7/16 b. 7/15 c. 14/16 d. 14/15