Bag A contains 9 red marbles and 3 green marbles. Bag B contains 9 black marbles and 6 orange marbles, Find the probability of selecting one green marble from bag A and one black marble from bag B.

1/10.

Step-by-step explanation:

There are 12 marbles in bag A and 15 in bag B.

Prob(Selecting green from bag A) =  3/12 = 1/4.

Prob(Selecting  black from bag B ) = 9/15 = 2/5.

So the  required probability = 1/4 * 2/5

= 2/20

= 1/10.

Note that the probabilities are multiplied because the 2 events are independent.

19

step-by-step explanation:

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.