Simplify this expression. –6w + (–8) + 1 + (–7w) A: -w - 7 B: -13w - 7 C: w + 9 D: 13w + 9

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