If someone could answer this about hanger diagrams? Also if you could explain how you did it so I don't have to keep asking. I'll give brainiest if possible (picture included)

Suppose i pick a jelly bean at random from a box containing one red and eleven blue ones. i record the color and put the jelly bean back in the box. if i do this three times, what is the probability of getting a blue jelly bean each time? (round your answer to three decimal places.)

How do i i solve this equation? -18 = x/3 + 3

What ratio is proportional to 18/21