Solve for x. Please I need help

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

How can constraints be used to model a real-world situation?

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.