HEL 2O POINT
If the first coin removed is blue, what is the probability of drawing a red coin after three red coins are put in the bag to replace the blue one? The probability of drawing a red coin after three red coins are put in the bag to replace the blue one that has been removed is

3/7

Step-by-step explanation:

9 blue coins and 3 red coins  were in the bag

We removed 1 blue coin

8 blue and 3 red

Now add 3 red coins

8 blue and 6 red coins = 14 coins

P ( red) = number of red coins / total coins

            = 6/ 14 = 3/7

x is variable or an unknown value to find

example:

2x = 5 which means x = 3

hello from mrbilldoesmath!

answer:   x (x+6)^2, choice b

discussion:

factor x out of the equation:

x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).

note that 6+6 = 12 and 6*6 = 36 so the above factors into:

x (x+6)^2

which is choice b

you,

mrb