A full bathtub is draining. After 5 minutes, there are 5 gallons of water left to drain. After 8 minutes, there are 10 gallons left to drain. Write and solve a linear equation to find how long it will take the bathtub to drain completely

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