Answer:
12.5
Step-by-step explanation:
(7/2) = 3.5
(3.5)^2 = 12.5
M is a midpoint of BC so:

Length of MA:

Length of NB:
16 red balloons to all 32 balloons
just add the number of balloons that aren't red and you got your answer, which is 32, and don't add in the red balloons because it is asking the ration to only the red balloons to all balloons