I cant see this very well but I believe the answer is C
Answer:
3x+7
Step-by-step explanation:
4x+7-x=4x-x+7=3x+7
40 flights if you're asking how many flights happen in 1 hour.
Answer:
Part 1) The rate is 
Part 2) 
Step-by-step explanation:
Part 1)
we know that
A cyclist rides her bike at a rate of 12 meters per second
Remember that
1 hour=3,600 seconds
1 kilometer=1,000 meters
therefore

Part 2) How many kilometers will the cyclist travel in 3 hours?
using proportion

Answer:
$57
Step-by-step explanation:
$380x0.85=$323
$380-$323=$57