Answer:
48/1369
Step-by-step explanation:
We have 37 marbles all together. If we pick one red marble, the chances of that are 6/37. If we replace it and pick a blue one, the chances of that are 8/37. Once we have these numbers, we multiply 6/37 x 8/37 and you will get 48/1369
13.24 is the radius
x= 1/3 , -4/3
9x^2 + 9x -4 =0
(3x-1) (3x+4) =0