Asked by Victoria

While playing a game, Rachel pulls two tiles out of a bag without looking and without replacing the first tile. The bag has two colors of tiles--black and white. There are 10 more white tiles than black tiles.

a. Write and simplify an expression that represents the probability that Rachel will pick a black tile, then a white tile.

A: x(x + 10)/(2x + 10)(2x + 9)

b. What is the probability that Rachel pulls a black tile and then a white tile if there are 5 black tiles in the bag berfore her first pick? Round your answer to the nearest hundredth.

A: ?
Answered by Steve
You got (a) correct. So, for (b), just plug in x=5 and evaluate the fraction.
Answered by Victoria
Thank you so much! So the correct answer is 15/76 or 0.20?

Please, will you help me with my other posts as well?
Answered by Victoria
Am I correct?

Answered by Steve
you are correct
Answered by Serena
the answer for a is x(x+10)/ (2x+10) (2x+9)
the answer for b is 0.20
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