The square of 9 less than a number is 3 less than the number. what is the number?
0
0
0
0
-12 or 7
-12 or -7
-7 or 12
7 or 12

Abag contains 5 red marbles , 6 blue marbles and 4 green marbles. susie selects a marble and returns it to the bag before selecting another marble. if susie selects a red marble 6 out of 20 times, what is the experimental probability that the next marble she selects will be a red marble ?