You can put this solution on YOUR website!
The correct answer to your question is....
First you need to add up your total amount of marbles... 7+11+5=23
Next you need to find the probability of drawing a rainbow marble... 5/23
Then it says that the rainbow marble is placed back into the bag, and a second marble is drawn, so we need to find the probability of selecting a lavender marble... 7/23
So the answer is..... 5/23, 7/23
The only way the amount of marbles (the denominator) would have changed is if the question said that the first marble drawn was not placed back into the bag. If that was the case then our denominator or amount of marbles would have changed to 22 instead of 23. Does this make sense and help you out?