Something that adds up to be 12 but multiplies to me 24

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

The distance between two points is 6.5cm and scale of map is 1: 1000 what's the distance between the two points

Is the number 128.439 a rational number