Answer:
6(b) =12(r) cuz for every 2 red birds it's one so just divide 12 by 2 and get 6 blue birds
You literally need to apply the formula

where
is the mass and
is the speed
You would save 7 hours and 31 minutes if you take a plane
F(x) = 3x - 5
f(2) = 3 (2) - 5
f (2) = 6-5
f (2) = 1