The answer it 1,067
got it now
2 whites and 1 black = 3 marbles
P(white + white) = (2/3)(1/2) = 2/6 = 1/3
P(white + black) = (2/3) (1/2) = 2/6 = 1/3
Ans: (a) 1/3 (b) 1/3
Distribute -0.5 into 0.3x - 0.6 to get -0.15x + 0.3 = -1.5, then subtract 0.3 from both sides to get -0.15x = -1.8, then divide both sides by -0.15 to get 12.