It costs $8 for a school dance ticket. it costs 859.32 dollars to have the school dance and how much tickets will cover the cost and ticket would have to be sold to make a profit of 980.68

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